0001171843-25-007481 | 10-K | XBRL Viewer | Northern Technologies International Corp

Commitments and Contingencies Disclosure [Text Block]

16.

COMMITMENTS AND CONTINGENCIES

Other Expense

In June 2025, NTIC China received a notice from Ningbo Customs, the customs authority at the Ningbo Port in China, regarding the historical export classification of Natur-Tec masterbatch resin products. Ningbo Customs determined that NTIC China misclassified certain products under a code that qualified for a 13% value-added tax rebate, and reclassified them under a code that does not qualify for a value-added tax rebate. As a result, NTIC China has been assessed repayment obligations of approximately $236,785 and penalties of approximately $150,000.

Management has accrued the full estimated liability of $386,785 in fiscal year 2025 within Other Expense. NTIC is evaluating potential avenues to negotiate a reduction in penalties; however, no such reductions have been agreed upon as of the issuance date of these financial statements.

Operating Leases

The Company currently has operating leases for various buildings, equipment and vehicles. These leases are under non-cancelable operating lease agreements with expiration dates between November 30, 2025 and May 31, 2028. The Company has the option to extend certain leases to five or ten-year term(s) and has the right of first refusal on any sale.

The Company records lease liabilities within current liabilities or long-term liabilities based upon the length of time associated with the lease payments. The Company records its long-term operating leases as right-of-use assets. Upon initial adoption, using the modified retrospective transition approach, no leases with terms less than 12 months have been capitalized to the consolidated balance sheet consistent with ASC 842. Instead, these leases are recognized in the consolidated statement of operations on a straight-line expense throughout the lives of the leases. None of the Company’s leases contain common area maintenance or security agreements.

The Company has made certain assumptions and judgments when applying ASC 842, the most significant of which is that the Company elected the package of practical expedients available for transition that allow the Company to not reassess whether expired or existing contracts contain leases under the new definition of a lease, lease classification for expired or existing leases and whether previously capitalized initial direct costs would qualify for capitalization under ASC 842. Additionally, the Company did not elect to use hindsight when considering judgments and estimates such as assessments of lessee options to extend or terminate a lease or purchase the underlying asset. The Company has no contingent rent agreements.

Present Value of Leases

	August 31, 2025		August 31, 2024
Right-of-use assets, net	$	493,050	$	424,558

Current portion of lease liability		344,739		325,116
Lease liability, less current portion		148,311		99,442
Total lease liability	$	493,050	$	424,558

The weighted-average remaining lease term was 0.80 years and 1.25 years as of August 31, 2025 and 2024, respectively. The Company’s lease agreements do not provide a readily determinable implicit rate nor is it available to the Company from its lessors. Instead, as of each of August 31, 2025 and 2024, the Company estimates the weighted-average discount rate for its operating leases to be 7.61%, based on the incremental borrowing rate.

Future minimum payments as of August 31, 2025 under these long-term operating leases are as follows (in thousands):

Fiscal 2026	$	344,739
Fiscal 2027		144,193
Fiscal 2028		38,018
Thereafter		—
Total future minimum lease payments		526,950
Less amount representing interest		(33,900	)
Present value of obligations under operating leases		493,050
Less current portion		(344,739	)
Long-term operating lease obligations	$	148,311

Operating lease cost under these leases was approximately $344,739 and $340,799 for the years ended August 31, 2025 and 2024, respectively.

Annual Bonus Plan

On August 28, 2025, the Compensation Committee of the Board of Directors of the Company approved the material terms of an annual bonus plan for the Company’s executive officers as well as certain officers and employees for the fiscal year ending August 31, 2026. For fiscal 2026, as in past years, the total amount available under the bonus plan for all plan participants, including executive officers, is dependent upon the Company’s earnings before interest, taxes, and other income (EBITOI), as adjusted to take into account amounts to be paid under the bonus plan and certain other adjustments (Adjusted EBITOI). Each plan participant’s percentage of the overall bonus pool is based upon the number of plan participants, the individual’s annual base salary, and the individual’s position and level of responsibility within the Company. In the case of each of the Company’s executive officer participants, 75% of the amount of their individual bonus payout will be determined based upon the Company’s actual EBITOI for fiscal 2026 compared to a pre-established target EBITOI for fiscal 2026, and 25% of the payout will be determined based upon such executive officer’s achievement of certain pre-established individual performance objectives. The payment of bonuses under the plan is discretionary, and bonuses may be paid to executive officer participants in both cash and shares of the Company’s common stock, the exact amount and percentages of which are determined by the Company’s Board of Directors, upon recommendation of the Compensation Committee, after the completion of the Company’s consolidated financial statements for fiscal 2026.

On August 26, 2024, the Compensation Committee of the Board of Directors of the Company approved the material terms of an annual bonus plan for the Company’s executive officers as well as certain officers and employees for the fiscal year ending August 31, 2025. $1,100,000 was recognized for bonuses for the fiscal year ended August 31, 2025, $800,000 of the bonus is comprised of stock options granted to management on September 1, 2024 that will be expensed over three years and $300,000 will be paid out in cash and profit sharing subsequent to year end. This is compared to $2,200,000 recognized for bonuses for the fiscal year ended August 31, 2024, $800,000 of the bonus comprised of stock options granted to management on September 1, 2023 and $1,400,000 was paid out in cash and profit sharing subsequent to year end.

Legal Matters

From time to time, the Company is subject to various other claims and legal actions in the ordinary course of its business. The Company records a liability in its consolidated financial statements for costs related to claims, including future legal costs, settlements and judgments, where the Company has assessed that a loss is probable and an amount could be reasonably estimated. If the reasonable estimate of a probable loss is a range, the Company records the most probable estimate of the loss or the minimum amount when no amount within the range is a better estimate than any other amount. The Company discloses a contingent liability even if the liability is not probable or the amount is not estimable, or both, if there is a reasonable possibility that material loss may have been incurred. In the opinion of management, as of August 31, 2025, the amount of liability, if any, with respect to these matters, individually or in the aggregate, will not materially affect the Company’s consolidated results of operations, financial position, or cash flows.

Note 12 - Segment and Geographic Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Gross profit	$ 31,676,555	$ 33,786,362
Indirect cost of goods sold	(52,557,919)	(51,273,155)
Total joint venture operations	8,545,207	9,475,078
Selling expenses	(17,820,196)	(16,413,672)
General and administrative expenses	(14,792,988)	(14,176,494)
Research and development expenses	(5,038,281)	(4,802,791)
Interest income	308,054	118,827
Interest expense	(599,927)	(340,129)
Other income	752,971	0
Income before income tax expense	3,031,395	7,647,181
Indirect Cost of Goods Sold [Member]
Indirect cost of goods sold	(3,028,311)	(3,501,176)
Operating Segments [Member]
Gross profit	34,704,866	37,287,538
ZERUST [Member] \| Operating Segments [Member]
Gross profit	26,953,091	29,468,741
NaturTec [Member] \| Operating Segments [Member]
Gross profit	$ 7,751,775	$ 7,818,797

Note 13 - Retirement Plan (Details Textual) - USD ($)	12 Months Ended
Note 13 - Retirement Plan (Details Textual) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	15.00%
Defined Contribution Plan Maximum Amount of Employees Contributions Percent	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.50%
Defined Contribution Plan, Cost	$ 339,319	$ 332,726

Note 10 - Net Income Per Common Share (Details Textual) - shares	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,833,783	305,514

Note 11 - Stock-based Compensation - Black-Scholes Option-pricing Model Assumptions (Details)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Dividend yield	2.15%	2.18%
Expected volatility	47.40%	46.10%
Expected life of option (years) (Year)	5 years	5 years
Weighted average risk-free interest rate	3.66%	4.23%

Note 6 - Intangible Assets, Net (Tables)

12 Months Ended

Aug. 31, 2025

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	As of August 31, 2025
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents and trademarks	$	3,546,542	$	(2,969,571	)	$	576,971
Capitalized software		4,089,695		(493,365	)		3,596,330
Customer relationships		6,347,000		(1,692,533	)		4,654,467
Total intangible assets, net	$	13,983,237	$	(5,155,469	)	$	8,827,768

	As of August 31, 2024
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents and trademarks	$	3,459,877	$	(2,854,532	)	$	605,345
Customer relationships		6,347,000		(1,269,400	)		5,077,600
Total intangible assets, net	$	9,806,877	$	(4,123,932	)	$	5,682,945

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Fiscal 2026	$	869,359
Fiscal 2027		834,284
Fiscal 2028		834,284
Fiscal 2029		834,284
Fiscal 2030		834,284
Thereafter		4,621,274
Total	$	8,827,768

Note 12 - Segment and Geographic Information (Tables)

12 Months Ended

Aug. 31, 2025

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

	Fiscal 2025		Fiscal 2024
ZERUST® net sales	$	62,488,397	$	63,092,575
Natur-Tec® net sales		21,746,077		21,966,942
Total net sales	$	84,234,474	$	85,059,517

Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block]

	Fiscal 2025		Fiscal 2024
Direct cost of goods sold
ZERUST®	$	35,535,306	$	33,623,834
Natur-Tec®		13,994,302		14,148,145
Indirect cost of goods sold		3,028,311		3,501,176
Total net cost of goods sold	$	52,557,919	$	51,273,155

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Fiscal 2025			Fiscal 2024
ZERUST® gross profit	$	26,953,091		$	29,468,741
Natur-Tec® gross profit		7,751,775			7,818,797
Total segment gross profit		34,704,866			37,287,538
Indirect cost of goods sold		(3,028,311	)		(3,501,176	)
Total gross profit	$	31,676,555		$	33,786,362
Total joint venture operations		8,545,207			9,475,078
Selling expenses		(17,820,196	)		(16,413,672	)
General and administrative expenses		(14,792,988	)		(14,176,494	)
Research and development expenses		(5,038,281	)		(4,802,791	)
Interest income		308,054			118,827
Interest expense		(599,927	)		(340,129	)
Other income		752,971			—
Income before income tax expense	$	3,031,395		$	7,647,181

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Fiscal Year Ended August 31,
	2025		2024
Inside the U.S. to unaffiliated customers	$	29,547,889	$	30,492,665
Outside the U.S. to:
Joint ventures in which the Company is a shareholder directly and indirectly		2,368,099		2,228,894
Unaffiliated customers		52,318,486		52,337,958
	$	84,234,474	$	85,059,517

	Fiscal 2025		% of Total Fees for Services Provided to Joint Ventures			Fiscal 2024		% of Total Fees for Services Provided to Joint Ventures
Germany	$	846,281		16.9	%	$	828,932		15.8	%
Poland		840,467		16.8	%		849,736		16.2	%
Japan		647,573		12.9	%		582,674		11.1	%
Finland		411,268		8.2	%		395,515		7.5	%
United Kingdom		404,342		8.1	%		375,150		7.1	%
Thailand		371,175		7.4	%		332,148		6.3	%
Sweden		330,205		6.6	%		445,560		8.5	%
France		320,546		6.4	%		485,627		9.2	%
Czech Republic		303,869		6.1	%		338,195		6.4	%
South Korea		186,669		3.7	%		258,314		4.9	%
Indonesia		137,125		2.7	%		166,053		3.2	%
Other		206,631		4.2	%		193,877		3.7	%
	$	5,006,151		100.0	%	$	5,251,782		100.0	%

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	At August 31, 2025		At August 31, 2024
China	$	5,355,918	$	5,627,202
Other		1,296,988		1,217,400
United States		8,531,012		9,421,051
Total property and equipment	$	15,183,918	$	16,265,653

Revenue from External Customers by Geographic Areas [Table Text Block]

	Fiscal Year Ended August 31, 2025		Fiscal Year Ended August 31, 2024
China	$	16,239,889	$	14,245,238
Brazil		6,570,850		5,994,372
India		22,620,639		22,189,317
Other		9,255,207		12,137,925
United States		29,547,889		30,492,665
Total net sales	$	84,234,474	$	85,059,517

Note 15 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
Note 15 - Income Taxes (Details Textual) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
INCOME TAX EXPENSE	$ 2,045,002	$ 1,325,797
Income Tax Expense (Benefit)	(2,045,002)	(1,325,797)
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	832,700
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	330,100
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	441,600
Tax Credit Carryforward, Valuation Allowance	13,153,200	12,694,800
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	458,400	761,100
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0
Foreign Tax Jurisdiction [Member]
INCOME TAX EXPENSE	200,000	(180,000)
Income Tax Expense (Benefit)	(200,000)	$ 180,000
Tax Credit Carryforward, Amount	2,814,400
Federal and State Tax [Member]
Tax Credit Carryforward, Amount	$ 5,575,300

Note 13 - Retirement Plan

12 Months Ended

Aug. 31, 2025

Retirement Benefits [Text Block]

13.

RETIREMENT PLAN

The Company has a 401(k) employee savings plan. Employees who meet certain age and service requirements may elect to contribute up to 15% of their salaries. The Company typically contributes the lesser of 50% of the participant’s contributions or 3.5% of the employee’s salary. The Company recognized expense for the savings plan of $339,319 and $332,726 for fiscal 2025 and fiscal 2024, respectively.

The entire disclosure for retirement benefits.

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Note 7 - Investments in Joint Ventures

12 Months Ended

Aug. 31, 2025

Equity Method Investments and Joint Ventures Disclosure [Text Block]

7.	INVESTMENTS IN JOINT VENTURES

The consolidated financial statements of the Company’s foreign joint ventures are initially prepared using the accounting principles accepted in the respective joint ventures’ countries of domicile. Amounts related to foreign joint ventures reported in the below tables and the accompanying consolidated financial statements have subsequently been adjusted to conform with U.S. GAAP in all material respects. All material profits on sales recorded that remain on the consolidated balance sheet from the Company to its joint ventures and from joint ventures to other joint ventures have been eliminated for financial reporting purposes.

Financial information from the audited and unaudited financial statements of the Company’s joint ventures in Germany, Excor Korrosionsschutz – Technologien und Produkte GmbH (EXCOR), France, ACOBAL SAS (Acobal), Finland, Zerust OY and all the Company’s other joint ventures are summarized as follows:

	As of August 31, 2025
	TOTAL		EXCOR		Acobal		Zerust OY		Other
Current assets	$	60,062,085	$	29,870,525	$	6,971,262	$	3,029,614	$	20,190,684
Total assets		69,815,251		36,941,008		7,900,298		3,313,909		21,660,036
Current liabilities		11,743,525		2,391,029		2,660,430		719,172		5,972,894
Noncurrent liabilities		336,557	—		—		—			336,557
Joint ventures’ equity		57,735,169		34,549,979		5,239,868		2,594,737		15,350,585
NTIC’s share of joint ventures’ equity		28,611,777		17,274,991		2,619,932		1,297,358		7,419,496
NTIC’s share of joint ventures’ undistributed earnings		27,667,432		17,244,086		2,619,932		1,277,358		6,526,056

	Fiscal Year Ended August 31, 2025
	TOTAL		EXCOR		Acobal		Zerust OY		Other
Net sales	$	91,236,272	$	32,909,789	$	11,721,152	$	4,831,258	$	41,774,073
Gross profit		39,460,739		17,637,075		4,500,635		2,976,462		14,346,567
Net income		7,081,482		3,325,785		1,418,240		964,653		1,372,804
NTIC’s share of equity in income of joint ventures		3,539,057		1,664,532		708,333		483,754		682,436
NTIC’s dividends received from joint ventures		1,566,946	—			635,528		382,613		548,805

	As of August 31, 2024
	Total		EXCOR		OTHER
Current assets	$	56,420,503	$	26,234,664	$	30,185,839
Total assets		64,183,071		31,513,288		32,669,783
Current liabilities		12,553,716		2,221,726		10,331,990
Noncurrent liabilities		323,199		—		323,199
Joint ventures’ equity		51,306,156		29,291,562		22,014,594
NTIC’s share of joint ventures’ equity		25,397,287		14,645,783		10,751,504
NTIC’s share of joint ventures’ undistributed earnings		23,645,685		14,614,878		9,030,807

	Fiscal Year Ended August 31, 2024
	Total		EXCOR		OTHER
Net sales	$	95,940,014	$	35,720,889	$	60,219,125
Gross profit		41,247,036		18,288,258		22,958,778
Net income		8,450,411		4,599,088		3,851,323
NTIC’s share of equity in income of joint ventures		4,223,296		2,299,274		1,924,022
NTIC’s dividends received from joint ventures		2,997,164		1,624,950		1,372,214

Note 4 - Inventories - Inventories (Details) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Production materials	$ 5,059,298	$ 5,513,409
Finished goods	10,465,932	8,877,435
Inventory, Net	$ 15,525,230	$ 14,390,844

Note 14 - Related Party Transactions

12 Months Ended

Aug. 31, 2025

14.

RELATED PARTY TRANSACTIONS

During both fiscal 2025 and fiscal 2024, the Company made consulting payments of $144,000 to Bioplastic Polymers LLC, an entity owned by Ramani Narayan, Ph.D., a director of the Company. Dr. Narayan provides certain consulting services to the Company relating to the Natur-Tec® business and bioplastics program.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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Note 12 - Segment and Geographic Information - Net Sales by Segment (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Net sales	$ 84,234,474	$ 85,059,517
ZERUST [Member]
Net sales	62,488,397	63,092,575
NaturTec [Member]
Net sales	$ 21,746,077	$ 21,966,942

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Note 10 - Net Income Per Common Share (Tables)

12 Months Ended

Aug. 31, 2025

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Numerator:	August 31, 2025		August 31, 2024
Net income attributable to NTIC	$	17,619	$	5,409,082

Denominator:
Basic-weighted shares outstanding		9,476,085		9,434,020
Weighted shares assumed upon exercise of stock options		163,592		399,430
Diluted – weighted shares outstanding		9,639,676		9,833,450

Basic net income per share:	$	0.00	$	0.57
Diluted net income per share:	$	0.00	$	0.55

Note 9 - Stockholders' Equity

12 Months Ended

Aug. 31, 2025

Equity [Text Block]

9.	STOCKHOLDERS’ EQUITY

During fiscal 2025, the Company’s Board of Directors declared cash dividends on the following dates in the following amounts to holders of record of the Company’s common stock as of the following record dates:

Declaration Date	Amount	Record Date	Payable Date
October 16, 2024	$0.07	October 30, 2024	November 13, 2024
January 15, 2025	$0.07	January 29, 2025	February 12, 2025
April 16, 2025	$0.01	April 30, 2025	May 14, 2025
July 16, 2025	$0.01	July 30, 2025	August 13, 2025

During fiscal 2024, the Company’s Board of Directors declared cash dividends on the following dates in the following amounts to holders of record of the Company’s common stock as of the following record dates:

Declaration Date	Amount	Record Date	Payable Date
October 18, 2023	$0.07	November 1, 2023	November 15, 2023
January 17, 2024	$0.07	January 31, 2024	February 14, 2024
April 17, 2024	$0.07	May 1, 2024	May 15, 2024
July 17, 2024	$0.07	July 31, 2024	August 14, 2024

During fiscal 2025 and fiscal 2024, the Company repurchased no shares of its common stock.

During fiscal 2025, the Company granted stock options under the Northern Technologies International Corporation 2024 Stock Incentive Plan (the 2024 Plan) to purchase an aggregate of 245,190 shares of its common stock to various employees and directors. The weighted average per share exercise price of the stock options is $13.26. The exercise price of the stock options is equal to the fair market value of the Company’s common stock on the date of grant. During fiscal 2025, stock options to purchase an aggregate of 12,000 shares of common stock were exercised at a weighted average exercise price of $7.43 per share on a net cashless exercise basis, resulting in no net issuance of common stock.

During fiscal 2025, the Company granted an aggregate of 11,313 restricted stock units under the 2024 Plan to various directors. The grant date fair value of the restricted stock units was $13.26 per share, which was equal to the fair market value of the Company’s common stock on the date of grant, September 1, 2024. The restricted stock units generally vest after one year, subject to continued service with the Company on the vesting date.

During fiscal 2024, the Company granted stock options under the Northern Technologies International Corporation 2019 Stock Incentive Plan (as amended, the 2019 Plan) and the 2024 Plan to purchase an aggregate of 269,844 shares of its common stock to various employees and directors. The weighted average per share exercise price of the stock options is $13.25. The exercise price of the stock options is equal to the fair market value of the Company’s common stock on the date of grant. During fiscal 2024, stock options to purchase an aggregate of 74,309 shares of common stock were exercised at a weighted average exercise price of $9.76 per share, resulting in the net issuance of 36,094 shares of common stock since some of the options were exercised on a net cashless exercise basis.

The Company issued 3,527 and 3,496 shares of common stock on September 1, 2024 and 2023, respectively, under the Northern Technologies International Corporation Employee Stock Purchase Plan (ESPP). The Company issued 3,856 and 3,284 shares of common stock on March 1, 2025 and 2024, respectively, under the ESPP. The ESPP is compensatory for financial reporting purposes. As of August 31, 2025, 47,871 shares of common stock remained available for sale under the ESPP.

The entire disclosure for equity.

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Note 12 - Segment and Geographic Information - Schedule of Geographic Distribution of Revenue (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Total net sales	$ 84,234,474	$ 85,059,517
CHINA
Total net sales	16,239,889	14,245,238
BRAZIL
Total net sales	6,570,850	5,994,372
INDIA
Total net sales	22,620,639	22,189,317
Other Countries [Member]
Total net sales	9,255,207	12,137,925
UNITED STATES
Total net sales	$ 29,547,889	$ 30,492,665

Note 6 - Intangible Assets, Net - Future Amortization Expense (Details) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Remainder of fiscal 2025	$ 869,359
Fiscal 2026	834,284
Fiscal 2027	834,284
Fiscal 2028	834,284
Fiscal 2029	834,284
Thereafter	4,621,274
Total	$ 8,827,768	$ 5,682,945

Note 15 - Income Taxes

12 Months Ended

Aug. 31, 2025

Income Tax Disclosure [Text Block]

15.

INCOME TAXES

The provision for income taxes for the fiscal years ended August 31, 2025 and 2024 was approximately as follows:

	Fiscal Year Ended August 31,
	2025		2024
Current:
Federal	$	—	$	—
State		69,000		48,000
Foreign		1,823,000		1,601,000
		1,892,000		1,649,000
Deferred:
Federal		—		—
State		—		—
Foreign		153,002		(323,203	)
		153,002		(323,203	)
	$	2,045,002	$	1,325,797

Reconciliations of the expected federal income tax at the statutory rate of 21.0% with the provisions for income taxes for the fiscal years ended August 31, 2025 and 2024 were approximately as follows:

	Fiscal Year Ended August 31,
	2025			2024
Tax computed at statutory rates	$	647,000		$	1,627,000
State income tax, net of federal benefit		120,000			21,000
Tax effect on equity in income of international joint ventures		(742,000	)		(887,000	)
Tax effect of foreign operations		875,000			371,000
Deemed repatriation		26,000			4,000
Foreign tax credit		—			(321,000	)
Research and development credit		(138,000	)		(512,000	)
Valuation allowance		1,363,000			1,066,000
Stock based compensation		77,002			175,000
Non-controlling interest		(62,000	)		(71,000	)
Prior year true-up		(112,000	)		(146,000	)
Other		(9,000	)		(1,203	)
	$	2,045,002		$	1,325,797

The Company has not provided U.S. income taxes or foreign withholding taxes with respect to its portion of the cumulative undistributed earnings of certain foreign subsidiaries and joint ventures that are essentially permanent in duration. As a result of the 2017 tax law changes, U.S. federal income taxes on dividends received from the Company’s foreign subsidiaries and joint ventures after December 31, 2017 have been generally eliminated. However, the Company continues to be subject to foreign withholding taxes upon repatriation of any undistributed earnings that are not essentially permanent in duration. The Company recorded tax expense of approximately $200,000 in fiscal 2025 and a tax benefit of approximately $180,000 during fiscal 2024, representing changes in the deferred tax liability for foreign withholding taxes to be paid with respect to the portion of the cumulative undistributed earnings of foreign subsidiaries and joint ventures that the Company determined were not essentially permanent in duration.

The Company measures deferred tax assets and liabilities using enacted tax rates that will apply in the years in which the temporary differences are expected to be recovered or paid. The tax effect of the temporary differences and tax carryforwards comprising the net deferred taxes shown on the consolidated balance sheets as of August 31, 2025 and 2024 was approximately as follows:

	August 31,
	2025			2024
Stock-based compensation	$	797,000		$	637,100
Foreign tax credit carryforward		2,814,400			3,844,800
Capitalized research and experimentation		2,472,400			2,037,800
Other credit and loss carryforward		6,757,900			5,974,200
Capital loss carryforward		129,900			—
Interest expense limitation		71,300			—
Other		922,400			965,368
Total deferred tax assets		13,965,300			13,459,268
Valuation allowance		(13,153,200	)		(12,694,800	)
Total deferred tax assets after valuation allowance		812,100			764,468
Right-of-use asset		(51,900	)		(64,700	)
Intangible assets		(1,457,700	)		(1,564,200	)
Unremitted foreign earnings		(234,600	)		(34,800	)
Other		(77,491	)		(61,100	)
Total deferred tax liabilities		(1,821,691	)		(1,724,800	)
Net deferred tax liabilities	$	(1,009,591	)	$	(960,332	)

As of August 31, 2025, the Company has foreign tax credit carryforwards of $2,814,400. This amount begins to expire to the extent not utilized by August 31, 2026. In addition, the Company had federal and state tax credit carryforwards of $5,575,300 as of August 31, 2025, which begin to expire in fiscal 2026. These federal and state tax credit carryforwards consist primarily of federal and Minnesota research and development credit carryforwards. The Company also has a deferred tax asset of $832,700 for federal net operating loss carryforwards and $330,100 for state net operating loss carryforwards as of August 31, 2025. The federal net operating loss carryforward has an indefinite carryforward period. The state net operating loss carryforward will begin to expire to the extent not utilized by August 31, 2026. The Company has a deferred tax asset of $441,600 for foreign net operating loss carryforwards, which will begin to expire to the extent not utilized by August 31, 2033.

The Company records a tax valuation allowance to reduce deferred tax assets to the amount expected to be realized when it is more likely than not that some portion or all of its deferred tax assets will not be realized.

The Company determined based on all available evidence, including historical data and projections of future results, that it is more likely than not that its domestic deferred tax assets will not be realized due to the absence of objectively verifiable sources of taxable income. On the basis of this evaluation, the Company has recorded a valuation allowance of $13,153,200 and $12,694,800 as of August 31, 2025 and 2024, respectively, to recognize only the portion of the deferred tax assets that is more likely than not to be realized. The net deferred tax asset as of August 31, 2025 and 2024 relates entirely to non-US deferred tax assets which are expected to be realized offset by deferred tax liability for withholding tax on cumulative undistributed earnings in foreign subsidiaries and joint ventures that the Company determined were not essentially permanent. The change in the valuation allowance totaled an increase of $458,400 and $761,100 for the years ended August 31, 2025 and 2024, respectively.

The following is a tabular reconciliation of the total amounts of approximated unrecognized tax benefits:

	Fiscal Year Ended August 31,
	2025			2024
Gross unrecognized tax benefits – beginning balance	$	399,300		$	361,200
Gross (decreases) increases – prior period tax positions		(17,400	)		(5,400	)
Gross increases – current period tax positions		40,000			43,500
Gross unrecognized tax benefits – ending balance	$	421,900		$	399,300

The entire amount of unrecognized tax benefits would affect the effective tax rate if recognized. It is not expected that the amount of unrecognized tax benefits will change significantly in the next 12 months.

The Company recognizes interest related to unrecognized tax benefits and penalties as income tax expense. Accrued interest and penalties are included within the related tax liability line in the consolidated balance sheet. There was no liability for the payment of interest and penalties as of both August 31, 2025 and August 31, 2024.

The Company is subject to taxation in the United States and various states and foreign jurisdictions. With few exceptions, as of August 31, 2025, the Company is no longer subject to federal, state, local, or foreign examinations by tax authorities for years prior to August 31, 2022.

On July 4, 2025, the One Big Beautiful Bill Act (“OBBBA”) was signed into law, which included various provisions, including the reinstatement of full expensing for qualified business property acquired and placed in service after January 19, 2025. Further, the OBBBA includes other provisions which are not effective for the Company until years ending August 31, 2026 and beyond, including immediate expensing of domestic research and experimental expenditures, modification of the limitation on the business interest deduction, and on the taxation of foreign operations. We do not expect the OBBBA to have a material impact on our consolidated financial statements.

The entire disclosure for income tax.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section S99
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-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
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Note 15 - Income Taxes - Reconciliations of the Expected Federal Income Tax at the Statutory Rate with the Provisions for Income Taxes (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Tax computed at statutory rates	$ 647,000	$ 1,627,000
State income tax, net of federal benefit	120,000	21,000
Tax effect on equity in income of international joint ventures	(742,000)	(887,000)
Tax effect of foreign operations	875,000	371,000
Deemed repatriation	26,000	4,000
Foreign tax credit	0	(321,000)
Research and development credit	(138,000)	(512,000)
Valuation allowance	1,363,000	1,066,000
Stock based compensation	77,002	175,000
Non-controlling interest	(62,000)	(71,000)
Prior year true-up	(112,000)	(146,000)
Other	(9,000)	(1,203)
Income Tax Expense (Benefit)	$ 2,045,002	$ 1,325,797

Note 9 - Stockholders' Equity - Cash Dividends Declared (Details) - $ / shares	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Amount, per share (in dollars per share)	$ 0.16	$ 0.28
O 2025 Q1 Dividends [Member]
Declaration date	Oct. 16, 2024
Amount, per share (in dollars per share)	$ 0.07
Record date	Oct. 30, 2024
Payable date	Nov. 13, 2024
Declaration date	Oct. 16, 2024
O 2024 Q1 Dividends [Member]
Declaration date		Oct. 18, 2023
Amount, per share (in dollars per share)		$ 0.07
Record date		Nov. 01, 2023
Payable date		Nov. 15, 2023
Declaration date		Oct. 18, 2023
O, 2024, Q2, Dividends [Member]
Declaration date		Jan. 17, 2024
Amount, per share (in dollars per share)		$ 0.07
Record date		Jan. 31, 2024
Payable date		Feb. 14, 2024
Declaration date		Jan. 17, 2024
O 2025 Q2 Dividends [Member]
Declaration date	Jan. 15, 2025
Amount, per share (in dollars per share)	$ 0.07
Record date	Jan. 29, 2025
Payable date	Feb. 12, 2025
Declaration date	Jan. 15, 2025
O, 2024, Q3, Dividends [Member]
Declaration date		Apr. 17, 2024
Amount, per share (in dollars per share)		$ 0.07
Record date		May 01, 2024
Payable date		May 15, 2024
Declaration date		Apr. 17, 2024
O, 2024, Q4, Dividends [Member]
Declaration date		Jul. 17, 2024
Amount, per share (in dollars per share)		$ 0.07
Record date		Jul. 31, 2024
Payable date		Aug. 14, 2024
Declaration date		Jul. 17, 2024
O 2025 Q3 Dividends [Member]
Declaration date	Apr. 16, 2025
Amount, per share (in dollars per share)	$ 0.01
Record date	Apr. 30, 2025
Payable date	May 14, 2025
Declaration date	Apr. 16, 2025
O 2025 Q4 Dividends [Member]
Declaration date	Jul. 16, 2025
Amount, per share (in dollars per share)	$ 0.01
Record date	Jul. 30, 2025
Payable date	Aug. 13, 2025
Declaration date	Jul. 16, 2025

Note 6 - Intangible Assets, Net (Details Textual) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Amortization of Intangible Assets	$ 777,289	$ 596,700

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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-SubTopic 30
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-Section 50
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-Subparagraph (a)(2)
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-Name Accounting Standards Codification
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-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-6

Note 12 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Cost of goods sold	$ 52,557,919	$ 51,273,155
Direct Cost of Goods Sold [Member] \| ZERUST [Member]
Cost of goods sold	35,535,306	33,623,834
Direct Cost of Goods Sold [Member] \| NaturTec [Member]
Cost of goods sold	13,994,302	14,148,145
Indirect Cost of Goods Sold [Member]
Cost of goods sold	$ 3,028,311	$ 3,501,176

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References + Details

Note 11 - Stock-based Compensation (Details Textual) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	1,923,138	1,752,665	1,557,132
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	245,190	269,844
Share-Based Payment Arrangement, Expense	$ 1,211,434	$ 1,381,169
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	1,010,384
Allocated Share-based Compensation Expense, Estimate Next Twelve Months	672,054
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two	$ 338,330
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 5.07	$ 5.04
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)	5 years 8 months 26 days	6 years 10 days
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award	10
Share-Based Payment Arrangement, Option [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	1 year
Share-Based Payment Arrangement, Option [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Expense	$ 148,652
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 0
The 2024 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized	800,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	245,190
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant	700,556
The 2024 Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	1 year
The 2019 Plan [member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	1,387,415
The 2007 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	290,533

Note 16 - Commitments and Contingencies - Present Value of Long-term Leases (Details) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Right-of-use assets, net	$ 493,050	$ 424,558
Current portion of lease liability	344,739	325,116
Lease liability, less current portion	148,311	99,442
Total lease liability	$ 493,050	$ 424,558

Note 15 - Income Taxes - Deferred Tax Asset (Liabilities) (Details) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Stock-based compensation	$ 797,000	$ 637,100
Foreign tax credit carryforward	2,814,400	3,844,800
Capitalized research and experimentation	2,472,400	2,037,800
Other credit and loss carryforward	6,757,900	5,974,200
Capital loss carryforward	129,900	0
Interest expense limitation	71,300	0
Other	922,400	965,368
Total deferred tax assets	13,965,300	13,459,268
Valuation allowance	(13,153,200)	(12,694,800)
Total deferred tax assets after valuation allowance	812,100	764,468
Right-of-use asset	(51,900)	(64,700)
Intangible assets	(1,457,700)	(1,564,200)
Unremitted foreign earnings	(234,600)	(34,800)
Other	(77,491)	(61,100)
Total deferred tax liabilities	(1,821,691)	(1,724,800)
Net deferred tax liabilities	$ (1,009,591)	$ (960,332)

Note 15 - Income Taxes - Provision for Income Taxes (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Federal	$ 0	$ 0
State	69,000	48,000
Foreign	1,823,000	1,601,000
Current Income Tax Expense (Benefit)	1,892,000	1,649,000
Federal	0	0
State	0	0
Foreign	153,002	(323,203)
Deferred Income Tax Expense (Benefit)	153,002	(323,203)
Income Tax Expense (Benefit)	$ 2,045,002	$ 1,325,797

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Topic 235
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Note 4 - Inventories

12 Months Ended

Aug. 31, 2025

Inventory Disclosure [Text Block]

4.	INVENTORIES

Inventories consisted of the following:

	August 31, 2025		August 31, 2024
Production materials	$	5,059,298	$	5,513,409
Finished goods		10,465,932		8,877,435
	$	15,525,230	$	14,390,844

Significant Accounting Policies (Policies)

12 Months Ended

Aug. 31, 2025

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

Principles of Consolidation – NTIC evaluates its voting and variable interests in entities on a qualitative and quantitative basis. NTIC consolidates entities in which it concludes it has the power to direct the activities that most significantly impact an entity’s economic success and has the obligation to absorb losses or the right to receive benefits that could be significant to the entity. The consolidated financial statements include the accounts of Northern Technologies International Corporation, its wholly owned subsidiaries, Northern Technologies Holding Company, LLC, NTIC (Shanghai) Co., Ltd. (NTIC China), ZERUST-EXCOR MEXICO, S. de R.L. de C.V (Zerust Mexico), NTIC Europe GmbH (NTI Europe), and HNTI Limited (Zerust India), NTIC’s majority-owned subsidiary in India, Natur-Tec India Private Limited (Natur-Tec India), NTIC’s majority-owned subsidiary in Brazil, Zerust Prevenção de Corrosão S.A. (Zerust Brazil), NTIC’s majority-owned subsidiary in Sri Lanka, Natur Tec Lanka (Pvt) Ltd (Natur Tec Lanka), and NTIC’s majority-owned holding company, NTI Asean LLC (NTI Asean), and its wholly owned subsidiary in UAE, Zerust Integrity Solutions Trading LLC (ZIS UAE), and its wholly owned subsidiaries Zerust Singapore Pte Ltd (Zerust Singapore), Zerust Vietnam Co. Ltd (Zerust Vietnam) and Zerust Taiwan Co. Ltd (Zerust Taiwan). NTIC’s consolidated financial statements do not include the accounts of any of its joint ventures.

Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block]

Non-Controlling Interests – The Company owns 75% of Natur-Tec India, 75% of Natur Tec Lanka, 85% of Zerust Brazil, 60% of NTI Asean, Zerust Singapore Pte Ltd, Zerust Vietnam Co Ltd and Zerust Taiwan Co Ltd. The remaining ownership of the consolidated entities are accounted for as non-controlling interests and reported as part of equity in the consolidated financial statements. The Company allocates gains and losses to the non-controlling interest even when such allocation results in a deficit balance, reducing the losses attributed to the controlling interest. Changes in ownership interests are treated as equity transactions if the Company maintains control.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates – The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Reclassification, Comparability Adjustment [Policy Text Block]

Reclassifications - Certain prior year amounts have been reclassified for consistency with the current period presentation. These reclassifications had no effect on the reported results of operations. An adjustment has been made to the Consolidated Balance Sheet as of August 31, 2024 and the Consolidated Statements of Cash Flows for the year ended August 31, 2024 to reclassify joint venture trade receivables within trade receivables.

In addition, the Company identified an immaterial prior period classification error related to the presentation of borrowings and repayments under its revolving line of credit in its consolidated statements of cash flows. For the fiscal year ended August 31, 2024, the Company had previously presented net proceeds of $691,608 as a single line item in the consolidated statements of cash flows. In accordance with Accounting Standards Codification 230, Statement of Cash Flows, the Company has updated the prior period presentation to separately report gross borrowings of $37,672,308 and gross repayments of $36,980,700 under its line of credit. This change had no impact on the Company’s total cash flows, financial position, or results of operations for the fiscal year ended August 31, 2024.

Revenue [Policy Text Block]

Net Sales – The Company includes net sales to its joint ventures and net sales to unaffiliated customers on its consolidated statements of operations. There are no sales originating from the Company’s joint ventures to unaffiliated customers included in the amount, as the Company’s investments in its joint ventures are accounted for using the equity method.

When determining recognition of revenue arrangements the Company performs the following five steps: (1) identify the contracts with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when or as the entity satisfies a performance obligation. The Company only applies the five-step model to contracts when it is probable that the entity will collect the consideration it is entitled to in exchange for the goods it transfers to, or services it performs for, the customer.

Generally, the Company’s performance obligations are satisfied when the customers take possession of the products, which normally occurs at the shipping point or destination depending on the terms of the contracts. The Company’s services are generally sold based upon quotes or contracts with customers that include a fixed or determinable price, and sales arrangements do not contain any significant financing component for its customers. The Company does not recognize revenue related to product warranties, nor does the Company incur significant contract costs. Customer arrangements do not generate contract assets or liabilities.

Revenue Recognition – Revenue is measured based on consideration specified in the contract with a customer, adjusted for any applicable estimates of variable consideration and other factors affecting the transaction price, including noncash consideration, consideration paid or payable to customers, and significant financing components. Revenue from all customers is recognized when a performance obligation is satisfied by transferring control of a distinct good or service to a customer.

Individually promised goods and services in a contract are considered a distinct performance obligation and accounted for separately if the customer can benefit from the individual good or service on its own or with other resources that are readily available to the customer and the good or service is separately identifiable from other promises in the arrangement. When an arrangement includes multiple performance obligations, the consideration is allocated between the performance obligations in proportion to their estimated standalone selling price. Costs related to products delivered are recognized in the period incurred, unless criteria for capitalization of costs are met. Costs of revenues consist primarily of direct labor, manufacturing overhead, materials, and components. The Company does not incur significant upfront costs to obtain a contract. If costs to obtain a contract were to become material, the costs would be recorded as an asset and amortized to expense in a manner consistent with the related recognition of revenue.

The Company excludes government assessed and imposed taxes on revenue generating transactions that are invoiced to customers from revenue. The Company includes freight billed to customers in revenue. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of goods sold.

The timing of revenue recognition, billing, and cash collections results in accounts receivable on the consolidated balance sheet.

Performance Obligations – A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. A contract’s transaction price is allocated to each distinct performance obligation in proportion to its standalone selling price and recognized as revenue when, or as, the performance obligation is satisfied. The Company’s various performance obligations and the timing or method of revenue recognition are discussed below. The Company’s technical service consultants work directly with the end users of NTIC’s ZERUST® rust and corrosion inhibiting products to analyze their specific needs and develop systems to meet their performance requirements.

The Company sells its products to both distributors and end-users. Each unit of product delivered under a customer order represents a distinct and separate performance obligation, as the customer can benefit from each unit on its own or with other resources that are readily available to the customer, and each unit of product is separately identifiable from other products in the arrangement.

The transaction price for the Company’s products is the invoiced amount. The Company does not have variable consideration in the form of refunds, credits, rebates, price concessions, pricing incentives, or other items impacting transaction price. The purchase order pricing in arrangements with customers is deemed to approximate standalone selling price; therefore, the Company does not need to allocate proceeds on a relative standalone selling price allocation between performance obligations. The Company applies the practical expedient in paragraph 606-10-50-14 and does not disclose information about remaining performance obligations that have original expected durations of one year or less. There are no material obligations that extend beyond one year.

Revenue is recognized when transfer of control occurs, as defined by the terms in the customer agreement. The Company immediately recognizes incidental items that are immaterial in the context of the contract. The Company has applied the practical expedient in paragraph 606-10-25-16A and does not assess if immaterial items are promised goods or services. The Company has also applied the practical expedient in paragraph 606-10-32-18 regarding the adjustment of the promised amount of consideration for the effects of a significant financing component when the customer pays for that good or service within one year or less, as the Company does not have any significant financing components in its customer arrangements since payment is received at or shortly after the point of sale, generally 30 to 90 days.

The Company estimates returns based on an analysis of historical experience if the right to return products is granted to its customers. The Company does not record a return asset, as non-conforming products are generally not returned. The Company’s return policy does not vary by geography. The customer has no rotation or price protection rights, and the Company is not under a warranty obligation.

Sales Commissions – Sales commissions paid to sales representatives are eligible for capitalization, as they are incremental costs that would not have been incurred without entering into a specific sales arrangement and are recoverable through the expected margin on the transaction. The Company has elected to apply the practical expedient provided by ASC 340-40-25-4 and recognize the incremental costs of obtaining contracts as an expense when incurred, as the amortization period of the assets that would have otherwise been recognized is one year or less. The Company records these costs as a selling expense.

Product Warranty – The Company offers warranties on various products and services. These warranties are assurance type warranties that are not sold on a standalone basis; therefore, they are not considered distinct performance obligations. The Company estimates the costs that may be incurred under its warranties and records a liability in the amount of such costs at the time the revenue is recognized for the product sale.

International Revenue – The Company markets its products to numerous countries in North America, Europe, Latin America, Asia, and other parts of the world. See Note 12, Segment and Geographic Information, for information regarding revenue disaggregation by geography.

Receivable [Policy Text Block]

Trade Receivables – Payment terms for the Company’s unaffiliated customers are determined based on credit risk and vary by customer. The Company typically offers standard payment terms to unaffiliated customers of net 30 days. The Company does not accrue interest on past due accounts receivable. The Company reviews the credit histories of its customers before extending unsecured credit. The Company presents accounts receivable, net of an allowance for credit losses. The allowance for credit losses reflects management’s estimate of amounts that will ultimately not be collected. The Company determines the allowance for credit losses based on historical information, changes in current economic conditions and reasonable and supportable forecasts of future economic conditions. The allowance for credit losses is measured on a collective (pool) basis when trade receivables share similar risk characteristics. Trade receivables that do share similar risk characteristics are evaluated on an individual basis and are also not included in the collective (pool) evaluation.

Employee Retention Credit [Policy Text Block]

Employee Retention Credit (ERC) and Payroll Tax Deferral - On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) was signed into law providing numerous tax provisions and other stimulus measures, including an employee retention credit (ERC), which is a refundable tax credit against certain employment taxes. The Taxpayer Certainty and Disaster Tax Relief Act of 2020 and the American Rescue Plan Act of 2021 extended and expanded the availability of the ERC.

The Company engaged tax advisors of a Big 4 accounting firm which determined the Company qualified for ERCs. The Company then applied for the ERC in fiscal 2023 for the second and third quarters of that year of $573,751 and $566,006, respectively. The Company elected to account for the credit as a government grant. U.S. GAAP does not include grant accounting guidance for for-profit entities; therefore, the Company has elected to follow the grant accounting model in International Accounting Standard (IAS) 20, Accounting for Government Grants and Disclosure of Government Assistance. In accordance with IAS 20, the Company cannot recognize any income from the grant until there is reasonable assurance (similar to the “probable” threshold in U.S. GAAP) that any conditions attached to the grant will be met and that the grant will be received. Once it is reasonably assured that the grant conditions will be met and that the grant will be received, grant income is recorded on a systematic basis over the periods in which the Company recognizes the payroll expenses for which the grant is intended to compensate. Income from the grant can be presented as either other income or as a reduction in the expenses for which the grant was intended to compensate.

During the fiscal year ended August 31, 2025, the Company received $1,139,756 in cash as a result of the ERC and this cash was claimed under the suspension test criteria based on the Company’s determination that it met the eligibility requirements. In accordance with the Company’s accounting policy, the ERC payments have been recognized as Other Income in the period in which the cash was received, as the Company determined that all relevant criteria for recognition had been met. The ERC represents a one-time benefit and does not constitute recurring operational revenue.

Additionally, the Company earned $181,529 in interest income related to the ERC payments, which was recorded as Interest Income for the period. The ERC payments of $1,139,756 are recorded as Other Income in the consolidated statements of operations, while the interest income of $181,529 is recorded separately under Interest Income in the consolidated statements of operations.

Receivables from Joint Ventures Policy [Policy Text Block ]

Fees for Services Provided to Joint Ventures – The Company provides services to its joint ventures including consulting, legal, travel, insurance, technical, and marketing services based on licensing or other agreements with its joint ventures. The Company receives fees for the services it provides to its joint ventures. The fees for services received by the Company from its joint ventures are generally based on either a flat fee or a percentage of net sales by the Company’s joint ventures depending on local laws and tax regulations. Under the Company’s agreements with its joint ventures, amounts are earned when product is shipped from joint venture facilities, at which point a sale is deemed to have occurred and results in obligation for the joint venture to pay the royalty and recognition of the fee by the Company. The Company reviews the financial situation of each of its joint ventures to assist in the likelihood of collections on amounts earned. The Company accounts for these fees on a cash basis if uncertainty exists surrounding the collection of such fees.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and Cash Equivalents – The Company includes as cash and cash equivalents highly liquid, short-term investments with maturity of three months or less when purchased, which are readily convertible into known amounts of cash. The Company maintains its cash in high quality financial institutions. The balances, at times, may exceed federally insured limits.

Inventory, Policy [Policy Text Block]

Inventories – Inventories are recorded at the lower of cost (first-in, first-out basis) or net realizable value and include a reduction in value based on slow-moving and obsolete inventory, which amounted to $422,344 and $365,341 in the fiscal years ending August 31, 2025 and 2024, respectively.

Property, Plant and Equipment, Policy [Policy Text Block]

Property and Equipment and Depreciation – Property and equipment are stated at cost. Depreciation is computed using the straight-line method based on the estimated service lives of the various assets as follows:

Buildings and improvements	5-30 years
Machinery and equipment	3-10 years

Equity Method Investments [Policy Text Block]

Investments in Joint Ventures – Investments in the Company’s joint ventures are accounted for using the equity method. Under the equity method, investments are initially recorded at cost and are adjusted for dividends, distributed and undistributed earnings and losses, changes in foreign currency exchange rates, and additional investments. In the event the Company’s share of a joint venture’s cumulative losses exceeds the Company’s investment balance, the balance is reported at zero value until proportionate income exceeds the losses. The Company assesses its joint ventures for impairment on an annual basis as of August 31 of each year as part of its fiscal year end analysis. In addition to the annual review for impairment, the Company reviews the operating results of each joint venture on a quarterly basis in comparison to its historical operating results and its accrual of fees for services provided to joint ventures. If the operating results of a joint venture do not meet financial performance expectations, an additional evaluation is performed on the joint venture. The Company’s evaluation of its investments in joint ventures requires the Company to make assumptions about future cash flows of its joint ventures. These assumptions require significant judgment, and actual results may differ from assumed or estimated amounts. All investments in joint ventures had positive equity as of August 31, 2025 and 2024. The Company considers any of its joint ventures to be significant and discloses entity specific financial information if the joint venture’s income or assets make up more than 20% of the Company’s total assets or income.

The Company classifies distributions received from its joint ventures based on the nature of the distributions, generally, in operating activities on the consolidated statements of cash flows.

If the Company is no longer able to exercise significant influence over operating and financial policy of a joint venture previously accounted for under the equity method, it maintains the investment at the carrying value as of the date that significant influence no longer exists and discontinues accruing the proportionate earnings or losses of the investment.

Investments are considered to be impaired when a decline in fair value is judged to be other-than-temporary. Fair value is calculated based on publicly available market information or other estimates determined by management. The Company employs a systematic methodology on a quarterly basis that considers available quantitative and qualitative evidence in evaluating potential impairment of our investments. If the cost of an investment exceeds its fair value, the Company evaluates, among other factors, general market conditions, credit quality, the duration and extent to which the fair value is less than cost, and for equity securities, the Company’s intent and ability to hold, or plans to sell, the investment. The Company also considers specific adverse conditions related to the financial health of and business outlook for the investee, including industry and sector performance, changes in technology, and operational and financing cash flow factors. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded to other income (expense), and a new cost basis in the investment is established. The Company determined that there was no impairment of investments in joint ventures as of August 31, 2025.

Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]

Recoverability of Long-Lived Assets – The Company reviews its long-lived assets whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable. The Company determines potential impairment by comparing the carrying value of the assets with expected net cash flows expected to be provided by operating activities of the business or related products. If the sum of the expected undiscounted future net cash flows is less than the carrying value, the Company evaluates whether an impairment loss should be recognized. An impairment loss is measured by comparing the amount by which the carrying value exceeds the fair value of the asset. When evaluating assets for impairment, the Company groups long-lived assets with other assets and liabilities at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities. The Company determined that there were no indications that the carrying value of long-lived assets was not recoverable as of August 31, 2025.

Intangible Assets, Finite-Lived, Policy [Policy Text Block]

Patents and Trademarks – Patents and trademarks, including acquisition costs, are stated at cost, less accumulated amortization. Amortization is computed using the straight-line method over the estimated useful lives of the respective assets. Upon retirement, the cost of assets disposed and the related accumulated amortization are removed from the accounts, and any resulting gain or loss is credited or charged to operations.

The Company estimates the useful life of patents to be 17 years and customer relationships to be 15 years. This estimate is based on a combination of factors, including the expected duration of patent protection, technological obsolescence, and market conditions. Amortization of intangible assets is recorded using the straight-line method over their estimated useful lives.

Internal Use Software, Policy [Policy Text Block]

Capitalization of Software Costs – Software developed or obtained for internal use, including direct development costs, is stated at cost, less accumulated amortization. Costs incurred during the preliminary project stage, as well as maintenance and training costs, are expensed as incurred. Capitalized software costs include external direct costs of materials and services and payroll costs for employees directly associated with software development. Amortization is computed using the straight-line method over the estimated useful life of the software, which is estimated to be ten years. Upon retirement, the cost of assets disposed and the related accumulated amortization are removed from the accounts, and any resulting gain or loss is credited or charged to operations.

Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]

Goodwill - Goodwill represents the excess purchase price over the fair value of tangible net assets acquired in acquisitions after amounts have been allocated to intangible assets. Goodwill is tested for impairment annually (at August 31), or more frequently when events or changes in circumstances indicate that the asset might be impaired. Examples of such events or circumstances include, but are not limited to, a significant adverse change in legal or business climate, an adverse regulatory action or unanticipated competition.

The Company assesses qualitative factors to determine whether the existence of events or circumstances would indicate that it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If after assessing the totality of events or circumstances, the Company were to determine that it is more likely than not that the fair value of the reporting unit is less than its carrying amount, then the Company would perform a quantitative test that compares the fair value to its carrying value to determine the amount of any impairment. The Company has determined there was no goodwill impairment during the years ended August 31, 2025 and 2024.

Income Tax, Policy [Policy Text Block]

Income Taxes – The Company utilizes the asset and liability method of accounting for income taxes, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial statements. Deferred income tax assets and liabilities are determined based on the differences between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in operations in the period that includes the enactment date.

The Company records net deferred tax assets to the extent the Company believes these assets will more likely than not be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. In the event the Company determines that it would be able to realize its deferred assets in the future in excess of their net recorded amount, the Company makes an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes.

The Company records uncertain tax positions on the basis of a two-step process whereby the Company determines whether it is more likely than not that the tax positions will be sustained based on the technical merits of the position and those tax positions that meet the more-likely-than-not recognition threshold. The Company recognizes the largest amount of tax benefit that is greater than 50 percent likely to be realized upon ultimate settlement with the related tax authority.

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency Translation (Accumulated Other Comprehensive Income (Loss)) – The functional currency of NTIC China, Zerust Brazil, Natur-Tec India, Natur Tec Lanka, Zerust Mexico, Zerust India, Zerust Singapore, Zerust Vietnam, Zerust Taiwan, NTI Europe, and each unconsolidated international joint venture is the applicable local currency. The translation of the applicable foreign currencies into U.S. dollars is performed for balance sheet accounts using exchange rates in effect at the balance sheet date and for revenue and expense accounts using an average monthly exchange rate. Translation gains or losses are reported as an element of other comprehensive income (loss).

The Company (excluding NTIC China, Zerust Brazil, Natur-Tec India, Natur Tec Lanka, Zerust India, Zerust Singapore, Zerust Vietnam, Zerust Taiwan, NTI Asean, Zerust Mexico, NTI Europe, and NTIC’s joint ventures) conducts all foreign transactions based on the U.S. dollar. Since investments in joint ventures are accounted for using the equity method, any changes in foreign currency exchange rates are reflected as a foreign currency translation adjustment and do not change the equity in income from joint ventures reflected in the Company’s consolidated statements of operations.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments – The carrying value of cash and cash equivalents, short-term accounts receivable, notes payable, trade accounts payables, and other accrued expenses approximate fair value because of the short maturity of those instruments.

Shipping and Handling Cost, Policy [Policy Text Block]

Shipping and Handling – The Company records all amounts billed to customers in a sales transaction related to shipping and handling as sales. The Company records costs related to shipping and handling in cost of goods sold.

Research and Development Expense, Policy [Policy Text Block]

Research and Development – The Company expenses all costs related to product research and development as incurred.

Stockholders' Equity, Policy [Policy Text Block]

Common Stock – The Company issues authorized but unissued shares of common stock upon the exercise of stock options.

Share-Based Payment Arrangement [Policy Text Block]

Stock-Based Compensation – The Company recognizes compensation cost relating to share-based payment transactions, including grants of employee stock options and transactions under the Company’s employee stock purchase plan, in its consolidated financial statements. That cost is measured based on the fair value of the equity or liability instruments issued. The Company measures the cost of employee services received in exchange for stock options and other stock-based awards based on the grant-date fair value of the award and recognizes the cost over the period the employee is required to provide services for the award (generally the vesting term).

Subsequent Events, Policy [Policy Text Block]

Subsequent Events – The Company has evaluated events occurring after the date of the consolidated financial statements through November 20, 2025 for events requiring disclosure in the consolidated financial statements.

Note 7 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Current assets	$ 44,342,816	$ 41,579,219
Total assets	102,745,280	94,676,502
Current liabilities	23,904,094	17,896,943
Non-current liabilities	2,128,461	1,604,238
Joint ventures’ equity	72,148,754	71,193,991
Investments in joint ventures	28,611,777	25,397,287
EXCOR and All Other Joint Ventures [Member]
Investments in joint ventures	28,611,777	25,397,287
NTIC’s share of joint ventures’ undistributed earnings	27,667,432	23,645,685
EXCOR [Member]
Investments in joint ventures	17,274,991	14,645,783
NTIC’s share of joint ventures’ undistributed earnings	17,244,086	14,614,878
All Other [Member]
Investments in joint ventures	7,419,496	10,751,504
NTIC’s share of joint ventures’ undistributed earnings	6,526,056	9,030,807
Acobal [Member]
Investments in joint ventures	2,619,932
NTIC’s share of joint ventures’ undistributed earnings	2,619,932
Zerust OY [Member]
Investments in joint ventures	1,297,358
NTIC’s share of joint ventures’ undistributed earnings	1,277,358
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Current assets	60,062,085	56,420,503
Total assets	69,815,251	64,183,071
Current liabilities	11,743,525	12,553,716
Non-current liabilities	336,557	323,199
Joint ventures’ equity	57,735,169	51,306,156
EXCOR [Member]
Current assets	29,870,525	26,234,664
Total assets	36,941,008	31,513,288
Current liabilities	2,391,029	2,221,726
Non-current liabilities	0	0
Joint ventures’ equity	34,549,979	29,291,562
Joint Ventures in France [Member]
Current assets		30,185,839
Total assets		32,669,783
Current liabilities		10,331,990
Non-current liabilities		323,199
Joint ventures’ equity		$ 22,014,594
Acobal [Member]
Current assets	6,971,262
Total assets	7,900,298
Current liabilities	2,660,430
Non-current liabilities	0
Joint ventures’ equity	5,239,868
Zerust OY [Member]
Current assets	3,029,614
Total assets	3,313,909
Current liabilities	719,172
Non-current liabilities	0
Joint ventures’ equity	2,594,737
All Other [Member]
Current assets	20,190,684
Total assets	21,660,036
Current liabilities	5,972,894
Non-current liabilities	336,557
Joint ventures’ equity	$ 15,350,585

Note 9 - Stockholders' Equity (Details Textual) - $ / shares					12 Months Ended
	Mar. 01, 2025	Sep. 01, 2024	Mar. 01, 2024	Sep. 01, 2023	Aug. 31, 2025	Aug. 31, 2024
Stock Repurchased and Retired During Period, Shares (in shares)					0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross					245,190	269,844
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price					$ 13.26	$ 13.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Including Cashless Exercises					12,000	74,309
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price					$ 7.43	$ 9.76
Stock Issued During Period, Shares, Employee Stock Purchase Plans	3,856	3,527	3,284	3,496
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 13.26
The 2024 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Including Cashless Exercises					12,000	74,309
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price					$ 7.43	$ 9.76
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)					0	36,094
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant					700,556
The 2024 Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted					11,313
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 13.26
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					1 year
The 2024 Plan [Member] \| Employees and Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross					245,190	269,844
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price					$ 13.26
The 2024 Plan [Member] \| Employees [Member]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price						$ 13.25
ESPP [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant					47,871

Note 2 - New Significant Accounting Policies

12 Months Ended

Aug. 31, 2025

Significant Accounting Policies [Text Block]

2.	NEW SIGNIFICANT ACCOUNTING POLICIES

In fiscal 2025, the Company adopted Accounting Standards Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. ASU 2023-07 requires enhanced disclosures about significant segment expenses and other segment items on both an annual and interim basis. The Company has applied the standard retrospectively to all periods presented in the consolidated financial statements. The adoption of ASU 2023-07 did not impact the Company’s determination of reportable segments but resulted in enhanced disclosures related to segment expense information. The adoption resulted in additional disclosures but did not have an impact on the Company's consolidated financial position, results of operations, or cash flows.

Note 16 - Commitments and Contingencies (Tables)

12 Months Ended

Aug. 31, 2025

Schedule of Components of Operating Lease Assets and Liabilities [Table Text Block]

	August 31, 2025		August 31, 2024
Right-of-use assets, net	$	493,050	$	424,558

Current portion of lease liability		344,739		325,116
Lease liability, less current portion		148,311		99,442
Total lease liability	$	493,050	$	424,558

Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]

Fiscal 2026	$	344,739
Fiscal 2027		144,193
Fiscal 2028		38,018
Thereafter		—
Total future minimum lease payments		526,950
Less amount representing interest		(33,900	)
Present value of obligations under operating leases		493,050
Less current portion		(344,739	)
Long-term operating lease obligations	$	148,311

Note 11 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Outstanding, balance (in shares)	1,752,665	1,557,132
Outstanding, weighted average exercise price (in dollars per share)	$ 11.47	$ 11.08
Options granted (in shares)	245,190	269,844
Options granted, weighted average exercise price (in dollars per share)	$ 13.26	$ 13.25
Options exercised (in shares)	(12,000)	(74,309)
Options exercised, weighted average exercise price (in dollars per share)	$ 7.43	$ 9.76
Options terminated (in shares)	(62,717)	0
Options terminated, weighted average exercise price (in dollars per share)	$ 7.43	$ 0
Outstanding, balance (in shares)	1,923,138	1,752,665
Outstanding, weighted average exercise price (in dollars per share)	$ 11.86	$ 11.47
Outstanding, aggregate intrinsic value	$ 62,547
Exercisable, balance (in shares)	1,476,274
Exercisable, weighted average exercise price (in dollars per share)	$ 11.52
Exercisable, aggregate intrinsic value	$ 62,547

Note 12 - Segment and Geographic Information - Schedule of Geographic Distribution (Details) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Total property and equipment, net	$ 15,183,918	$ 16,265,653
CHINA
Total property and equipment, net	5,355,918	5,627,202
Other Countries [Member]
Total property and equipment, net	1,296,988	1,217,400
UNITED STATES
Total property and equipment, net	$ 8,531,012	$ 9,421,051

Note 14 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Bioplastic Polymers LLC [Member] \| Consulting Payment Expense [Member]
Related Party Transaction, Amounts of Transaction	$ 144,000	$ 144,000

Insider Trading Arrangements	12 Months Ended
Insider Trading Arrangements	Aug. 31, 2025
Trading Arrangements, by Individual [Table]
Material Terms of Trading Arrangement [Text Block]	Item 9B. OTHER INFORMATION Rule 10b5-1 Plan and Non-Rule 10b5-1 Trading Arrangement Adoptions, Terminations, and Modifications During the three months ended August 31, 2025, none of our directors or “officers” (as defined in Rule 16a-1(f) under the Exchange Act) adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408 of SEC Regulation S-K.
Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Note 6 - Intangible Assets, Net - Intangible Assets, Net (Details) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Gross Carrying Amount	$ 13,983,237	$ 9,806,877
Accumulated Amortization	(5,155,469)	(4,123,932)
Net Carrying Amount	8,827,768	5,682,945
Intangible assets, net	8,827,768	5,682,945
Patents and Trademarks [Member]
Gross Carrying Amount	3,546,542	3,459,877
Accumulated Amortization	(2,969,571)	(2,854,532)
Net Carrying Amount	576,971	605,345
Intangible assets, net	576,971	605,345
Customer Relationships [Member]
Gross Carrying Amount	6,347,000	6,347,000
Accumulated Amortization	(1,692,533)	(1,269,400)
Net Carrying Amount	4,654,467	5,077,600
Intangible assets, net	4,654,467	$ 5,077,600
Computer Software, Intangible Asset [Member]
Gross Carrying Amount	4,089,695
Accumulated Amortization	(493,365)
Net Carrying Amount	3,596,330
Intangible assets, net	$ 3,596,330

Consolidated Balance Sheets (Parentheticals) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Accounts Receivable, Allowance for Credit Loss, Current	$ 235,000	$ 310,000
Preferred Stock, No Par Value (in dollars per share)	$ 0	$ 0
Preferred Stock, Shares Authorized (in shares)	10,000	10,000
Preferred Stock, Shares Issued (in shares)	0	0
Preferred Stock, Shares Outstanding (in shares)	0	0
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.02	$ 0.02
Common Stock, Shares Authorized (in shares)	15,000,000	15,000,000
Common Stock, Shares, Outstanding (in shares)	9,475,490	9,466,976
Common Stock, Shares, Issued (in shares)	9,475,490	9,466,976

Note 8 - Corporate Debt

12 Months Ended

Aug. 31, 2025

Debt Disclosure [Text Block]

8.	CORPORATE DEBT

The Company is party to a Credit Agreement (as amended, the Credit Agreement) with JPMorgan Chase Bank, N.A. (JPM), which provides NTIC with a senior secured revolving line of credit (the Credit Facility) of up to $10.0 million. The Credit Facility includes a $5.0 million sublimit for standby letters of credit. Borrowings of $9,329,021 were outstanding under the Credit Facility as of August 31, 2025. Since NTIC was out of compliance with the fixed charge coverage ratio under the Credit Agreement, NTIC obtained a waiver of the non-compliance from JPM. Based on its current business plan and projections for fiscal 2026, NTIC expects to remain in compliance with the covenant during fiscal 2026, although no assurance can be provided that it will do so.

The principal amount under the Credit Facility, together with all accrued unpaid interest and other amounts owing thereunder, if any, will be payable in full on the January 5, 2026 maturity date, unless the Credit Facility is extended or renewed or terminated earlier. The Company is currently in negotiations with the bank to renew the Credit Facility.

Borrowings under the Credit Agreement bear interest at a floating rate, at the option of the Company, equal to either the CB Floating Rate or the Adjusted SOFR Rate. The term “CB Floating Rate” means the greater of the Prime Rate in the United States or 2.50%. The term “Adjusted SOFR Rate” means the term secured overnight financing rate for either one, three or six months (depending on the interest period selected by the Company) plus 0.10% per annum. With respect to any borrowings using an Adjusted SOFR Rate, there is an applicable margin of 2.35% applied per annum. There is no applicable margin with respect to borrowings using a CB Floating Rate. The weighted average interest rate was 6.61% and 7.44% for fiscal 2025 and 2024, respectively.

To secure the Credit Agreement, the Company assigned JPM a continuing security interest in all of its right, title and interest in collateral made up of the assets of the Company. The Credit Agreement contains customary affirmative and negative covenants, including, among other matters, limitations on the Company’s ability to incur additional debt, grant liens, engage in certain business operations and transactions, make certain investments, modify its organizational documents or form any new subsidiaries, subject to certain exceptions. Further, the Credit Agreement contains a negative covenant that restricts the ability of the Company to redeem or repurchase its common stock or pay dividends if the result of which would cause an event of default under the Credit Agreement. The Credit Agreement also requires the Company to maintain a Fixed Charge Coverage Ratio of at least 1.25 to 1.00. The term “Fixed Charge Coverage Ratio” means the ratio, computed for the Company on a consolidated basis, of net income plus income tax expense, plus amortization expense, plus depreciation expense, plus interest expense, and plus dividends received from joint ventures, minus unfinanced capital expenditures and equity in income from joint ventures, all computed for the twelve month period then ending, to scheduled principal payments made, plus scheduled finance lease payments made, plus interest expense paid, plus income tax expense paid, and plus cash distributions and dividends paid, all computed for the same twelve month period then ending.

The Credit Agreement also contains customary events of default, including, without limitation, payment defaults, material inaccuracy of representations and warranties, covenant defaults, bankruptcy and insolvency proceedings, cross-defaults to certain other agreements, breach of any financial covenant and change of control. Upon the occurrence and during the continuance of any event of default, JPM may accelerate the payment of the obligations thereunder and exercise various other customary default remedies.

On each of April 22, 2025 and May 29, 2025, the Company’s wholly owned subsidiary in China, NTIC China, renewed its loan agreements with China Construction Bank Corporation. Each term loan provided NTIC China with a RMB 10,000,000 (USD $1.39 million). The term loans mature in April 2026 and May 2026, respectively, unless extended. The term loan that matures in April 2026 has an annual interest rate of 2.75% with interest due monthly, and the term loan that matures in May 2026 has an annual interest rate of 2.96% with interest due monthly. Both term loans are secured by an office building owned by NTIC China and the loan agreements contain certain financial and other covenants. The Company was in compliance with the covenants as of August 31, 2025. The outstanding balance as of August 31, 2025 for both term loans is a total of USD $2,804,695. The outstanding balance as of August 31, 2024 for both term loans was a total of USD $2,820,835.

On August 30, 2025, the Company’s majority owned subsidiary in India, Natur-Tec India, entered into a Foreign Currency Term Loan Agreement with IDFC FIRST Bank Limited (the Bank). The term loan provides Natur-Tec India with a facility of INR 500 lakhs (USD $600,000) to finance the purchase of land in Chennai, India. The loan was disbursed on August 30, 2025 for INR 461 lakhs (USD $522,545) and is repayable in 85 monthly installments to a US dollar account of USD $7,899 each beginning October 5, 2025 and continuing through September 5, 2032. Borrowings bear interest at a fixed rate of 6.45% per annum. The loan is secured by a lien over Natur-Tec India’s cash deposits with the Bank totaling INR 476 lakhs (USD $539,731), and the related land purchase is expected to be registered in late November 2025. The outstanding balance as of August 31, 2025 was INR 461 lakhs (USD $522,545), of which INR 61.7 lakhs (USD $55,561) was classified as current and INR 399.3 lakhs (USD $466,984) as long-term. The term loan contains customary affirmative and negative covenants applicable to Natur-Tec India, including, among other matters, restrictions on incurring additional indebtedness, creating liens, or changing the nature of its business. Natur-Tec India was in compliance with all covenants as of August 31, 2025.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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Note 17 - Supplemental Cash Flow Information

12 Months Ended

Aug. 31, 2025

Cash Flow, Supplemental Disclosures [Text Block]

17.

SUPPLEMENTAL CASH FLOW INFORMATION

Supplemental disclosures of cash flow information consisted of:

	Fiscal Year Ended August 31,
	2025		2024
Cash paid for income tax	$	1,605,283	$	1,191,538
Cash paid for interest		599,927		340,129
Cash paid for operating leases		344,739		340,799

Note 9 - Stockholders' Equity (Tables)

12 Months Ended

Aug. 31, 2025

Dividends Declared [Table Text Block]

Declaration Date	Amount	Record Date	Payable Date
October 16, 2024	$0.07	October 30, 2024	November 13, 2024
January 15, 2025	$0.07	January 29, 2025	February 12, 2025
April 16, 2025	$0.01	April 30, 2025	May 14, 2025
July 16, 2025	$0.01	July 30, 2025	August 13, 2025

Declaration Date	Amount	Record Date	Payable Date
October 18, 2023	$0.07	November 1, 2023	November 15, 2023
January 17, 2024	$0.07	January 31, 2024	February 14, 2024
April 17, 2024	$0.07	May 1, 2024	May 15, 2024
July 17, 2024	$0.07	July 31, 2024	August 14, 2024

Note 16 - Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Jun. 30, 2025
Lessee, Operating Lease, Option to Extend Term One	5 years
Lessee, Operating Lease, Option to Extend Term Two	10 years
Finance and Operating Lease, Weighted Average Remaining Lease Term	9 months 18 days	1 year 3 months
Operating Lease, Weighted Average Discount Rate, Percent	7.61%	7.61%
Operating Lease, Expense	$ 344,739	$ 340,799
Accrued Bonuses	1,100,000	2,200,000
Stock Options Granted to Management [Member]
Accrued Bonuses	800,000	800,000
Paid Out in Cash and Profit Sharing [Member]
Accrued Bonuses	$ 300,000	$ 1,400,000
Annual Bonus Plan [Member] \| Executive Officer [Member]
Percentage of Individual Bonus Payout Determined by Actual Versus Targeted EBITOI Results	75.00%
Percentage of Individuals Payout Determined Upon Achievement of Certain Pre-Established Individual Performance Objectives	25.00%
NTIC China [Member] \| Misclassified Products [Member]
Loss Contingency, Misclassification of Tax Rebate, Percentage			13.00%
Loss Contingency, Repayment Obligations			$ 236,785
Loss Contingency, Penalties			$ 150,000
Loss Contingency Accrual	$ 386,785

Note 17 - Supplemental Cash Flow Information (Tables)

12 Months Ended

Aug. 31, 2025

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

	Fiscal Year Ended August 31,
	2025		2024
Cash paid for income tax	$	1,605,283	$	1,191,538
Cash paid for interest		599,927		340,129
Cash paid for operating leases		344,739		340,799

Note 12 - Segment and Geographic Information - Information by Geographic Location (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Net sales	$ 84,234,474	$ 85,059,517
Total Fees	$ 5,006,151	$ 5,251,782
Total Fees percentage	100.00%	100.00%
Inside the USA to Unaffiliated Customers [Member]
Net sales	$ 29,547,889	$ 30,492,665
GERMANY
Total Fees	$ 846,281	$ 828,932
Total Fees percentage	16.90%	15.80%
Joint Ventures in Which the Company is a Shareholder Directly and Indirectly Outside the USA [Member]
Net sales	$ 2,368,099	$ 2,228,894
POLAND
Total Fees	$ 840,467	$ 849,736
Total Fees percentage	16.80%	16.20%
Unaffiliated Customers Outside the USA [Member]
Net sales	$ 52,318,486	$ 52,337,958
JAPAN
Total Fees	$ 647,573	$ 582,674
Total Fees percentage	12.90%	11.10%
FINLAND
Total Fees	$ 411,268	$ 395,515
Total Fees percentage	8.20%	7.50%
UNITED KINGDOM
Total Fees	$ 404,342	$ 375,150
Total Fees percentage	8.10%	7.10%
THAILAND
Total Fees	$ 371,175	$ 332,148
Total Fees percentage	7.40%	6.30%
SWEDEN
Total Fees	$ 330,205	$ 445,560
Total Fees percentage	6.60%	8.50%
FRANCE
Total Fees	$ 320,546	$ 485,627
Total Fees percentage	6.40%	9.20%
CZECHIA
Total Fees	$ 303,869	$ 338,195
Total Fees percentage	6.10%	6.40%
KOREA, REPUBLIC OF
Total Fees	$ 186,669	$ 258,314
Total Fees percentage	3.70%	4.90%
INDONESIA
Total Fees	$ 137,125	$ 166,053
Total Fees percentage	2.70%	3.20%
Other Countries [Member]
Net sales	$ 9,255,207	$ 12,137,925
Total Fees	$ 206,631	$ 193,877
Total Fees percentage	4.20%	3.70%

Consolidated Statements of Operations - USD ($)	12 Months Ended
Consolidated Statements of Operations - USD ($)	Aug. 31, 2025	Aug. 31, 2024
NET SALES:
Net sales	$ 84,234,474	$ 85,059,517
Cost of goods sold	52,557,919	51,273,155
Gross profit	31,676,555	33,786,362
JOINT VENTURE OPERATIONS:
Equity in income from joint ventures	3,539,056	4,223,296
Fees for services provided to joint ventures	5,006,151	5,251,782
Total joint venture operations	8,545,207	9,475,078
OPERATING EXPENSES:
Selling expenses	17,820,196	16,413,672
General and administrative expenses	14,792,988	14,176,494
Research and development expenses	5,038,281	4,802,791
Total operating expenses	37,651,465	35,392,957
OPERATING INCOME	2,570,297	7,868,483
INTEREST INCOME	308,054	118,827
INTEREST EXPENSE	(599,927)	(340,129)
OTHER INCOME	1,139,756	0
OTHER EXPENSE	(386,785)	0
INCOME BEFORE INCOME TAX EXPENSE	3,031,395	7,647,181
INCOME TAX EXPENSE	2,045,002	1,325,797
NET INCOME	986,393	6,321,384
NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS	968,774	912,302
NET INCOME ATTRIBUTABLE TO NTIC	$ 17,619	$ 5,409,082
NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE:
Basic (in dollars per share)	$ 0	$ 0.57
Diluted (in dollars per share)	$ 0	$ 0.55
WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING:
Basic (in shares)	9,476,085	9,434,020
Diluted (in shares)	9,639,676	9,833,450
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.16	$ 0.28

Note 1 - Nature of Business and Significant Accounting Policies (Details Textual)	3 Months Ended		12 Months Ended
	May 31, 2023 USD ($)	Feb. 28, 2023 USD ($)	Aug. 31, 2025 USD ($)	Aug. 31, 2024 USD ($)
Number of Countries in which Entity Operates			65
Number of Operating Segments			2
Number of Joint Venture Arrangements			15
Proceeds from Lines of Credit			$ 31,987,921	$ 37,672,308
Repayments of Lines of Credit			26,950,508	36,980,700
Inventory Valuation Reserves			422,344	365,341
Goodwill, Impairment Loss			$ 0	0
Patents [Member]
Finite-Lived Intangible Asset, Useful Life			17 years
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life			15 years
Employee Retention Credit [Member]
Government Assistance, Income, Increase (Decrease)			$ 1,139,756
Government Assistance, Nonoperating Income, Increase (Decrease)			$ 181,529
Government Assistance, Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration]			OTHER INCOME
Government Assistance, Nonoperating Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration]			INTEREST INCOME
Employee Retention Credits [Member]
Tax Credit Carryforward, Amount Subject to Approval	$ 566,006	$ 573,751
Previously Reported [Member]
Proceeds from Lines of Credit				$ 691,608
Natur-Tech India [Member]
Subsidiary, Ownership Percentage, Parent			75.00%
Natur Tec Lanka [Member]
Subsidiary, Ownership Percentage, Parent			75.00%
Zerust Brazil [Member]
Subsidiary, Ownership Percentage, Parent			85.00%
NTI Asean LLC [Member]
Subsidiary, Ownership Percentage, Parent			60.00%
Maximum [Member] \| Various Joint Ventures [Member]
Subsidiary, Ownership Percentage, Parent			50.00%

Note 6 - Intangible Assets, Net

12 Months Ended

Aug. 31, 2025

Intangible Assets Disclosure [Text Block]

6.	INTANGIBLE ASSETS, NET

Intangible assets, net consisted of the following:

	As of August 31, 2025
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents and trademarks	$	3,546,542	$	(2,969,571	)	$	576,971
Capitalized software		4,089,695		(493,365	)		3,596,330
Customer relationships		6,347,000		(1,692,533	)		4,654,467
Total intangible assets, net	$	13,983,237	$	(5,155,469	)	$	8,827,768

	As of August 31, 2024
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents and trademarks	$	3,459,877	$	(2,854,532	)	$	605,345
Customer relationships		6,347,000		(1,269,400	)		5,077,600
Total intangible assets, net	$	9,806,877	$	(4,123,932	)	$	5,682,945

Amortization expense related to intangible assets was $777,289 for fiscal 2025 compared to $596,700 for fiscal 2024.

As of August 31, 2025, future amortization expense related to intangible assets for each of the next five fiscal years and thereafter is estimated as follows:

Fiscal 2026	$	869,359
Fiscal 2027		834,284
Fiscal 2028		834,284
Fiscal 2029		834,284
Fiscal 2030		834,284
Thereafter		4,621,274
Total	$	8,827,768

Cybersecurity Risk Management and Strategy Disclosure

12 Months Ended

Aug. 31, 2025

Cybersecurity Risk Management, Strategy, and Governance [Line Items]

Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]

Item 1C. CYBERSECURITY

Background

Cybersecurity, data privacy, and data protection are critical to NTIC’s business. In the ordinary course of business, NTIC collects and stores certain confidential information, such as information about employees, contractors, vendors, customers, and suppliers. NTIC has processes in place for assessing, identifying, and managing material risks from cybersecurity threats, and NTIC regularly assesses its performance and identifies areas for improvement. NTIC also has implemented measures to safeguard its entire cyber network. Management continually re-assesses NTIC’s cybersecurity risk environment based on changing circumstances and new information identified by monitoring, scanning and testing its systems, as well as utilizing third party resources for testing.

Risk Management and Strategy

NTIC’s processes for assessing, identifying, and managing cybersecurity threats have been integrated into its overall risk management processes. The information provided by these processes facilitates management’s ongoing assessment of NTIC’s cybersecurity risk environment and provides current and accurate information regarding cybersecurity risks to management, the Audit Committee and Board of Directors to allow appropriate management of such risks through remediation or other risk mitigation activities.

NTIC maintains a cybersecurity program that is designed to identify, protect from, detect, respond to, and recover from cybersecurity threats and risks, and protect the confidentiality, integrity, and availability of its information systems, including the information residing on such systems. NTIC takes a risk-based approach to cybersecurity, which begins with the identification and evaluation of cybersecurity risks or threats that could affect its operations, finances, legal or regulatory compliance, or reputation. The scope of NTIC’s evaluation encompasses risks that may be associated with both its internally managed IT systems and key business functions and sensitive data operated or managed by third-party service providers. Once identified, cybersecurity risks and related mitigation efforts are prioritized based on their potential impact, likelihood, velocity, and vulnerability, considering both quantitative and qualitative factors. Risk mitigation strategies are developed and implemented based on the specific nature of each cybersecurity risk. These strategies include, among others, the application of cybersecurity policies and procedures, implementation of administrative, technical, and physical controls, and employee training, education, and awareness initiatives.

Cybersecurity Risk Management Processes Integrated [Flag]

true

Cybersecurity Risk Management Processes Integrated [Text Block]

Cybersecurity Risk Management Third Party Engaged [Flag]

true

Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]

true

Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]

true

Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]

As of the date of this filing, NTIC has not identified any cybersecurity threats that have materially affected or are reasonably anticipated to have a material effect on NTIC’s business strategy, results of operations or financial condition.

Cybersecurity Risk Board of Directors Oversight [Text Block]

Role of Management

Management has implemented risk management structures, policies, and procedures and is responsible for NTIC’s day-to-day cybersecurity risk management. NTIC’s Information Technology Director, who possesses a strong foundation in cybersecurity through prior managerial experience and specialized training, oversees the daily assessment and management of cybersecurity risks. NTIC employs best practices, including real-time monitoring, anti-virus protection, and ongoing patch management across all systems. System maintenance is performed in accordance with industry standards and aligned with recognized best practices. Because cybersecurity threats continue to evolve, NTIC’s implemented measures are designed to be flexible and adaptable to respond to changes in the security landscape. The following security measures give some insight as to what has been implemented:

	●	Multifactor authentication
	●	Phishing simulations
	●	User permissions auditing and tightening
	●	Proactive blocking of high-risk email
	●	Active monitoring of user sign-in
	●	On-premises endpoint reduction
	●	Endpoint detection and response
	●	Licensing, network, and hardware compliance management

Use of Consultants and Advisors

NTIC engages various third-party cybersecurity service providers to assess and enhance its cybersecurity practices and assist with protection and monitoring of its systems and information, including with respect to protection of its e-mail, system access, network monitoring, endpoint protection, vulnerability assessments, and penetration testing. NTIC engages cybersecurity consultants, auditors, and other third parties to assess and enhance its cybersecurity practices, such as a third party consulting firm to perform tabletop exercises and evaluate NTIC’s cyber processes, including an assessment of its incident response procedures.

Board Oversight

The Board of Directors, both directly and through the delegation of responsibilities to the Audit Committee, oversees the proper functioning of NTIC’s cybersecurity risk management program. In particular, the Audit Committee, which is comprised entirely of independent directors, is responsible for reviewing and discussing guidelines and policies governing the process by which senior management of NTIC assesses and manages NTIC’s exposure to risk and reviewing and discussing NTIC’s major financial risk exposures, including cybersecurity risk, and the steps management has taken to monitor and control such exposures; it being understood that it is the job of management to assess and management NTIC’s exposure to risk and that the Audit Committee’s responsibility is to discuss guidelines and policies by which risk assessment and management are undertaken. The Audit Committee additionally receives periodic updates from senior management on NTIC’s policies, processes, procedures and any significant developments related to the identification, mitigation and remediation of cybersecurity risks and is responsible for reviewing the cybersecurity disclosures required to be included in NTIC’s SEC filings.

Although none of the members of the Audit Committee has any work experience, degree, or certifications related to information security or cybersecurity, the Audit Committee works closely with members of management and NTIC has engaged third-party service providers to further enhance its cybersecurity efforts and the oversight thereof by the Audit Committee.

Risks from Material Cybersecurity Threats

Although NTIC has taken steps to prevent and mitigate data security threats, there can be no assurance that its protective measures and those of its third party service providers will prevent or detect security breaches that could have a significant impact on NTIC’s business, reputation, operating results and financial condition. NTIC maintains cyber liability insurance; however, this insurance may not be sufficient to cover the financial, legal, business or reputational losses that may result from an interruption or breach of NTIC’s systems.As of the date of this filing, NTIC has not identified any cybersecurity threats that have materially affected or are reasonably anticipated to have a material effect on NTIC’s business strategy, results of operations or financial condition. Although NTIC has not experienced cybersecurity incidents that are individually, or in the aggregate, material, NTIC has experienced cyberattacks in the past, which NTIC believes have thus far been mitigated by preventative, detective, and responsive measures it has put in place. See the factors described in the “Part I. Item 1.A. Risk Factors” section of this Form 10-K for further detail about the cybersecurity risks NTIC faces. Maintaining a robust information security system is an ongoing priority for NTIC, and NTIC plans to continue to identify and evaluate new, emerging risks to data protection and cybersecurity both within NTIC and through its engagement of third-party service providers.

Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]

Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]

Cybersecurity Risk Role of Management [Text Block]

Cybersecurity Risk Management Positions or Committees Responsible [Flag]

true

Cybersecurity Risk Management Positions or Committees Responsible [Text Block]

Cybersecurity Risk Management Expertise of Management Responsible [Text Block]

Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]

Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]

true

Note 1 - Nature of Business and Significant Accounting Policies

12 Months Ended

Aug. 31, 2025

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

1.	NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

Nature of Business – Northern Technologies International Corporation and its Subsidiaries (collectively, the Company) develop and market proprietary environmentally beneficial products and services in over 65 countries either directly or via a network of subsidiaries, joint ventures, independent distributors, and agents. The Company’s primary business is corrosion prevention marketed mainly under the ZERUST® brand. The Company has been selling its proprietary ZERUST® products and services to the automotive, general industrial, mechanical, mining, agricultural, and retail consumer markets for over 50 years and, more recently, has also expanded into the oil and gas industry. Additionally, the Company markets and sells a portfolio of proprietary bio-based and certified compostable (fully biodegradable) polymer resin compounds and finished products under the Natur-Tec® brand. These sustainable packaging products are intended to reduce the Company’s customers’ carbon footprint and provide environmentally sound waste disposal options. The Company’s two operating and reportable segments are ZERUST® and Natur-Tec®.

The Company participates, either directly or indirectly, in 15 active joint venture arrangements in North America, Europe, and Asia. Each of these joint ventures generally manufactures and markets products in the geographic territory to which it is assigned. While most of the Company’s joint ventures exclusively sell rust and corrosion inhibiting products, some of the joint ventures also sell the Company’s Natur-Tec® resin compounds and finished products. The profits of joint ventures are shared by the respective joint venture owners in accordance with their respective ownership percentages. The Company typically owns 50% or less of its joint venture entities and does not control the decisions of these entities, including dividend declaration or amount in any given year.

The timing of revenue recognition, billing, and cash collections results in accounts receivable on the consolidated balance sheet.

Buildings and improvements	5-30 years
Machinery and equipment	3-10 years

The Company classifies distributions received from its joint ventures based on the nature of the distributions, generally, in operating activities on the consolidated statements of cash flows.

Research and Development – The Company expenses all costs related to product research and development as incurred.

Common Stock – The Company issues authorized but unissued shares of common stock upon the exercise of stock options.

Note 15 - Income Taxes - Reconciliation of the Total Amounts of Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Gross unrecognized tax benefits, balance	$ 399,300	$ 361,200
Gross (decreases) increases – prior period tax positions	(17,400)	(5,400)
Gross increases – current period tax positions	40,000	43,500
Gross unrecognized tax benefits, balance	$ 421,900	$ 399,300

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
Consolidated Statements of Cash Flows - USD ($)	Aug. 31, 2025	Aug. 31, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 986,393	$ 6,321,384
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	1,360,086	1,381,169
Depreciation expense	979,981	1,156,364
Amortization expense	777,289	596,700
Loss on disposal of property and equipment	77,984	0
Change in allowance for credit losses	(75,000)	(233,539)
Equity in income from joint ventures	(3,539,056)	(4,223,296)
Dividends received from joint ventures	1,566,947	2,997,164
Deferred income taxes	50,984	(336,252)
Changes in current assets and liabilities:
Trade	941,732	(3,016,064)
Fees for services provided to joint ventures	157,463	61,578
Dividends receivable from joint venture	0	1,986,027
Income taxes	(418)	(311,731)
Inventories, net	(1,277,772)	(1,333,954)
Prepaid expenses and other	(300,058)	308,064
Accounts payable	1,472,793	449,009
Income tax payable	109,712	(151,720)
Accrued liabilities	(846,105)	232,290
Net cash provided by operating activities	2,442,955	5,883,193
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(1,526,437)	(1,917,842)
Proceeds from sale of property and equipment	20,000	0
Investments in patents and capitalized software costs	(2,423,886)	(1,500,386)
Net cash used in investing activities	(3,930,323)	(3,418,228)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividend received by non-controlling interest	(280,000)	(1,255,076)
Repayments of line of credit	(26,950,508)	(36,980,700)
Proceeds from issuance of long-term debt	538,090	0
Proceeds from line of credit	31,987,921	37,672,308
Dividends paid on NTIC common stock	(1,515,361)	(2,642,298)
Proceeds from employee stock purchase plan	81,496	79,967
Proceeds from exercise of stock options	0	168,519
Net cash provided by (used in) financing activities	3,861,638	(2,957,280)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(75,931)	38,326
NET INCREASE IN CASH AND CASH EQUIVALENTS	2,298,339	(453,989)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	4,952,184	5,406,173
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 7,250,523	$ 4,952,184

Note 5 - Property and Equipment, Net (Details Textual) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Depreciation expense	$ 979,981	$ 1,156,364

Consolidated Balance Sheets - USD ($)	Aug. 31, 2025	Aug. 31, 2024
CURRENT ASSETS:
Cash and cash equivalents	$ 7,250,523	$ 4,952,184
Receivables:
Trade, less allowance for credit losses of $235,000 and $310,000 as of August 31, 2025 and 2024	18,443,230	19,187,079
Fees for services provided to joint ventures	1,077,552	1,235,016
Income taxes	340,002	392,293
Inventories, net	15,525,230	14,390,844
Prepaid expenses	1,706,279	1,421,803
Total current assets	44,342,816	41,579,219
PROPERTY AND EQUIPMENT, NET	15,183,918	16,265,653
OTHER ASSETS:
Investments in joint ventures	28,611,777	25,397,287
Deferred income tax, net	503,575	544,464
Intangible assets, net	8,827,768	5,682,945
Goodwill	4,782,376	4,782,376
Operating lease right of use assets	493,050	424,558
Total other assets	43,218,546	36,831,630
Total assets	102,745,280	94,676,502
CURRENT LIABILITIES:
Line of credit	9,329,021	4,291,608
Term loan, current portion	2,860,256	2,820,835
Accounts payable	8,044,196	6,393,355
Income taxes payable	414,304	327,781
Payroll and related benefits	1,844,817	3,163,372
Other	1,066,761	574,876
Current portion of operating leases	344,739	325,116
Total current liabilities	23,904,094	17,896,943
LONG-TERM LIABILITIES:
Deferred income tax, net	1,513,166	1,504,796
Term loans, noncurrent portion	466,984	0
Operating leases, less current portion	148,311	99,442
Total long-term liabilities	2,128,461	1,604,238
Commitments and Contingencies
EQUITY:
Preferred stock, no par value; authorized 10,000 shares; none issued and outstanding	0	0
Common stock, $0.02 par value per share; authorized 15,000,000 shares; issued and outstanding 9,475,490 and 9,466,976, as of August 31, 2025 and 2024, respectively	189,510	189,340
Additional paid-in capital	25,056,976	23,615,564
Retained earnings	52,273,469	53,771,211
Accumulated other comprehensive loss	(5,371,201)	(6,382,124)
Stockholders’ equity	72,148,754	71,193,991
Non-controlling interests	4,563,971	3,981,330
Total equity	76,712,725	75,175,321
Total liabilities and equity	102,745,280	94,676,502
Intangible Assets Excluding Patents and Trademarks [Member]
OTHER ASSETS:
Intangible assets, net	$ 8,827,768	$ 5,682,945

Consolidated Statements of Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
BALANCE (in shares) at Aug. 31, 2023	9,424,102
BALANCE at Aug. 31, 2023	$ 188,482	$ 21,986,767	$ 51,004,427	$ (6,823,403)	$ 4,342,524	$ 70,698,797
Stock options exercised (in shares)	36,094
Stock options exercised	$ 722	167,797	0	0	0	168,519
Stock issued for employee stock purchase plan (in shares)	6,780
Stock issued for employee stock purchase plan	$ 136	79,831	0	0	0	79,967
Stock option expense	0	1,381,169	0	0	0	1,381,169
Dividends paid to stockholders	0	0	(2,642,298)	0	0	(2,642,298)
Dividend received by non-controlling interest					(1,255,076)	(1,255,076)
Net income	0	0	5,409,082	0	912,302	6,321,384
Other comprehensive income (loss)	$ 0	0	0	441,279	(18,420)	422,859
BALANCE (in shares) at Aug. 31, 2024	9,466,976
BALANCE at Aug. 31, 2024	$ 189,340	23,615,564	53,771,211	(6,382,124)	3,981,330	75,175,321
Stock options exercised (in shares)	1,127
Stock options exercised	$ 23	(23)	0	0	0	0
Stock issued for employee stock purchase plan (in shares)	7,383
Stock issued for employee stock purchase plan	$ 147	81,349	0	0	0	81,496
Stock option expense	0	1,360,086	0	0	0	1,360,086
Dividends paid to stockholders	0	0	(1,515,361)	0	0	(1,515,361)
Dividend received by non-controlling interest					(280,000)	(280,000)
Net income	0	0	17,619	0	968,774	986,393
Other comprehensive income (loss)	$ 0	0	0	1,010,923	(106,133)	904,790
BALANCE (in shares) at Aug. 31, 2025	9,475,490
BALANCE at Aug. 31, 2025	$ 189,510	$ 25,056,976	$ 52,273,469	$ (5,371,201)	$ 4,563,971	$ 76,712,725

Note 17 - Supplemental Cash Flow Information - Supplemental Disclosures of Cash Flow Information (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Cash paid for income tax	$ 1,605,283	$ 1,191,538
Cash paid for interest	599,927	340,129
Cash paid for operating leases	$ 344,739	$ 340,799

Note 15 - Income Taxes (Tables)

12 Months Ended

Aug. 31, 2025

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Fiscal Year Ended August 31,
	2025		2024
Current:
Federal	$	—	$	—
State		69,000		48,000
Foreign		1,823,000		1,601,000
		1,892,000		1,649,000
Deferred:
Federal		—		—
State		—		—
Foreign		153,002		(323,203	)
		153,002		(323,203	)
	$	2,045,002	$	1,325,797

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Fiscal Year Ended August 31,
	2025			2024
Tax computed at statutory rates	$	647,000		$	1,627,000
State income tax, net of federal benefit		120,000			21,000
Tax effect on equity in income of international joint ventures		(742,000	)		(887,000	)
Tax effect of foreign operations		875,000			371,000
Deemed repatriation		26,000			4,000
Foreign tax credit		—			(321,000	)
Research and development credit		(138,000	)		(512,000	)
Valuation allowance		1,363,000			1,066,000
Stock based compensation		77,002			175,000
Non-controlling interest		(62,000	)		(71,000	)
Prior year true-up		(112,000	)		(146,000	)
Other		(9,000	)		(1,203	)
	$	2,045,002		$	1,325,797

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	August 31,
	2025			2024
Stock-based compensation	$	797,000		$	637,100
Foreign tax credit carryforward		2,814,400			3,844,800
Capitalized research and experimentation		2,472,400			2,037,800
Other credit and loss carryforward		6,757,900			5,974,200
Capital loss carryforward		129,900			—
Interest expense limitation		71,300			—
Other		922,400			965,368
Total deferred tax assets		13,965,300			13,459,268
Valuation allowance		(13,153,200	)		(12,694,800	)
Total deferred tax assets after valuation allowance		812,100			764,468
Right-of-use asset		(51,900	)		(64,700	)
Intangible assets		(1,457,700	)		(1,564,200	)
Unremitted foreign earnings		(234,600	)		(34,800	)
Other		(77,491	)		(61,100	)
Total deferred tax liabilities		(1,821,691	)		(1,724,800	)
Net deferred tax liabilities	$	(1,009,591	)	$	(960,332	)

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	Fiscal Year Ended August 31,
	2025			2024
Gross unrecognized tax benefits – beginning balance	$	399,300		$	361,200
Gross (decreases) increases – prior period tax positions		(17,400	)		(5,400	)
Gross increases – current period tax positions		40,000			43,500
Gross unrecognized tax benefits – ending balance	$	421,900		$	399,300

Note 16 - Commitments and Contingencies - Future Minimum Rents Due (Details) - USD ($)	Aug. 31, 2025	Aug. 31, 2024
Fiscal 2025	$ 344,739
Fiscal 2026	144,193
Fiscal 2027	38,018
Thereafter	0
Total future minimum lease payments	526,950
Less amount representing interest	(33,900)
Long-term operating lease obligations	493,050	$ 424,558
Less current portion	(344,739)	(325,116)
Long-term operating lease obligations	$ 148,311	$ 99,442

Note 12 - Segment and Geographic Information (Details Textual)	12 Months Ended
	Aug. 31, 2025
2	2

Note 18 - Subsequent Events (Details Textual) - $ / shares		12 Months Ended
	Oct. 15, 2025	Aug. 31, 2025	Aug. 31, 2024
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)		$ 0.16	$ 0.28
O 2026 Q1 Dividends [Member] \| Subsequent Event [Member]
Declaration date	Oct. 15, 2025
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.01
Dividends Payable, Date to be Paid	Nov. 12, 2025
Dividends Payable, Date of Record	Oct. 29, 2025

Note 7 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Net sales	$ 84,234,474	$ 85,059,517
Gross profit	31,676,555	33,786,362
Net income	17,619	5,409,082
NTIC’s share of equity in income from joint ventures	3,539,056	4,223,296
EXCOR and All Other Joint Ventures [Member]
Net income	7,081,482	8,450,411
NTIC’s share of equity in income from joint ventures	3,539,057	4,223,296
NTIC’s dividends received from joint ventures	1,566,946	2,997,164
EXCOR [Member]
Net income	3,325,785	4,599,088
NTIC’s share of equity in income from joint ventures	1,664,532	2,299,274
NTIC’s dividends received from joint ventures	0	1,624,950
All Other [Member]
Net income	1,372,804	3,851,323
NTIC’s share of equity in income from joint ventures	682,436	1,924,022
NTIC’s dividends received from joint ventures	548,805	1,372,214
Acobal [Member]
Net income	1,418,240
NTIC’s share of equity in income from joint ventures	708,333
NTIC’s dividends received from joint ventures	635,528
Zerust OY [Member]
Net income	964,653
NTIC’s share of equity in income from joint ventures	483,754
NTIC’s dividends received from joint ventures	382,613
EXCOR and All Other Joint Ventures [Member]
Net sales	91,236,272	95,940,014
Gross profit	39,460,739	41,247,036
EXCOR [Member]
Net sales	32,909,789	35,720,889
Gross profit	17,637,075	18,288,258
All Other [Member]
Net sales	41,774,073	60,219,125
Gross profit	14,346,567	$ 22,958,778
Acobal [Member]
Net sales	11,721,152
Gross profit	4,500,635
Zerust OY [Member]
Net sales	4,831,258
Gross profit	$ 2,976,462

Note 5 - Property and Equipment, Net (Tables)

12 Months Ended

Aug. 31, 2025

Property, Plant and Equipment [Table Text Block]

	August 31, 2025			August 31, 2024
Land	$	1,260,312		$	1,238,180
Buildings and improvements		14,650,361			14,760,250
Construction in process		817,946			3,086,479
Machinery and equipment		9,154,728			7,276,151
		25,883,347			26,361,060
Less accumulated depreciation		(10,699,429	)		(10,095,407	)
	$	15,183,918		$	16,265,653

Note 11 - Stock-based Compensation (Tables)

12 Months Ended

Aug. 31, 2025

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Fiscal Year 2025			Fiscal Year 2024
Dividend yield		2.15	%		2.18	%
Expected volatility		47.4	%		46.1	%
Expected life of option (years)	5			5
Weighted average risk-free interest rate		3.66	%		4.23	%

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Number of Shares (#)			Weighted Average Exercise Price		Aggregate Intrinsic Value
Outstanding as of August 31, 2023		1,557,132		$	11.08
Options granted		269,844			13.25
Options exercised		(74,309	)		9.76
Options terminated		—			—

Outstanding as of August 31, 2024		1,752,665		$	11.47
Options granted		245,190			13.26
Options exercised		(12,000	)		7.43
Options terminated		(62,717	)		7.43

Outstanding as of August 31, 2025		1,923,138		$	11.86	$	62,547

Exercisable as of August 31, 2025		1,476,274		$	11.52	$	62,547

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value
Outstanding as of August 31, 2024		—	$	—
Granted		11,313		13.26
Vested/Settled		—		—

Outstanding as of August 31, 2025		11,313	$	13.26

Note 18 - Subsequent Events

12 Months Ended

Aug. 31, 2025

Subsequent Events [Text Block]

18.

SUBSEQUENT EVENT

On October 15, 2025, the Company’s Board of Directors declared a cash dividend of $0.01 per share of the Company’s common stock, payable on November 12, 2025 to stockholders of record on October 29, 2025. The declaration of future dividends is not guaranteed and will be determined by the Company’s Board of Directors in light of conditions then existing, including the Company’s earnings, financial condition, cash requirements, restrictions in financing agreements, business conditions, and other factors.

Insider Trading Policies and Procedures	12 Months Ended
Insider Trading Policies and Procedures	Aug. 31, 2025
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted [Flag]	true

Note 4 - Inventories (Tables)

12 Months Ended

Aug. 31, 2025

Schedule of Inventory, Current [Table Text Block]

	August 31, 2025		August 31, 2024
Production materials	$	5,059,298	$	5,513,409
Finished goods		10,465,932		8,877,435
	$	15,525,230	$	14,390,844

Note 10 - Net Income Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Net income	$ 17,619	$ 5,409,082
Basic-weighted shares outstanding (in shares)	9,476,085	9,434,020
Weighted shares assumed upon exercise of stock options (in shares)	163,592	399,430
Diluted – weighted shares outstanding (in shares)	9,639,676	9,833,450
Basic net income per share: (in dollars per share)	$ 0	$ 0.57
Diluted net income per share: (in dollars per share)	$ 0	$ 0.55

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
NET INCOME	$ 986,393	$ 6,321,384
OTHER COMPREHENSIVE INCOME – FOREIGN CURRENCY TRANSLATION ADJUSTMENT, (NET OF TAX)	904,790	422,859
COMPREHENSIVE INCOME	1,891,183	6,744,243
COMPREHENSIVE INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS, (NET OF TAX)	(862,641)	(893,882)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NTIC	$ 1,028,542	$ 5,850,361

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Note 12 - Segment and Geographic Information

12 Months Ended

Aug. 31, 2025

Segment Reporting Disclosure [Text Block]

12.

SEGMENT AND GEOGRAPHIC INFORMATION

Segment Information

The Company’s chief operating decision maker (CODM) is its Chief Executive Officer. The Company’s business is organized into two reportable segments: ZERUST® and Natur-Tec®. The Company has been selling its proprietary ZERUST® rust and corrosion inhibiting products and services to the automotive, general industrial, mechanical, mining, agricultural, and retail consumer markets for over 50 years and, more recently, has also expanded into the oil and gas industry. The Company also sells a portfolio of proprietary bio-based and compostable (fully biodegradable) polymer resins and finished products under the Natur-Tec® brand.

The accounting policies of the segments are the same as those described in the summary of significant accounting policies. There are no intersegment sales and no operating segments have been aggregated.

The following tables present the Company’s net sales by segment:

	Fiscal 2025		Fiscal 2024
ZERUST® net sales	$	62,488,397	$	63,092,575
Natur-Tec® net sales		21,746,077		21,966,942
Total net sales	$	84,234,474	$	85,059,517

The following table sets forth the Company’s cost of goods sold by segment:

	Fiscal 2025		Fiscal 2024
Direct cost of goods sold
ZERUST®	$	35,535,306	$	33,623,834
Natur-Tec®		13,994,302		14,148,145
Indirect cost of goods sold		3,028,311		3,501,176
Total net cost of goods sold	$	52,557,919	$	51,273,155

The following table sets forth the Company’s gross profit by segment:

	Fiscal 2025			Fiscal 2024
ZERUST® gross profit	$	26,953,091		$	29,468,741
Natur-Tec® gross profit		7,751,775			7,818,797
Total segment gross profit		34,704,866			37,287,538
Indirect cost of goods sold		(3,028,311	)		(3,501,176	)
Total gross profit	$	31,676,555		$	33,786,362
Total joint venture operations		8,545,207			9,475,078
Selling expenses		(17,820,196	)		(16,413,672	)
General and administrative expenses		(14,792,988	)		(14,176,494	)
Research and development expenses		(5,038,281	)		(4,802,791	)
Interest income		308,054			118,827
Interest expense		(599,927	)		(340,129	)
Other income		752,971			—
Income before income tax expense	$	3,031,395		$	7,647,181

The Company utilizes product net sales, direct and indirect cost of goods sold, and gross profit for each product in reviewing the financial performance of a product type. Further allocation of Company expenses or assets, aside from amounts presented in the tables above, is not utilized in evaluating product performance, nor does such allocation occur for internal financial reporting. The CODM uses gross profit and considers budget-to-actual variances on a quarterly basis when making decisions about the allocation of operating and capital resources to each segment. The CODM also uses segment gross profit for evaluating pricing strategy to assess the performance of each segment by comparing the results of each segment with one another and in determining the compensation of certain employees. The CODM has ultimate responsibility for enterprise decisions and making resource allocation decisions for the company and the segments. Asset information, including capital expenditures are reviewed by the CODM at the consolidated entity level and not by segment. Refer to total assets on the consolidated balance sheets.

Geographic Information

Net sales by geographic location for fiscal 2025 and fiscal 2024 were as follows:

	Fiscal Year Ended August 31,
	2025		2024
Inside the U.S. to unaffiliated customers	$	29,547,889	$	30,492,665
Outside the U.S. to:
Joint ventures in which the Company is a shareholder directly and indirectly		2,368,099		2,228,894
Unaffiliated customers		52,318,486		52,337,958
	$	84,234,474	$	85,059,517

Net sales by geographic location are based on the location of the customer. No single customer accounted for more than 10% of consolidated revenue.

Fees for services provided to joint ventures by geographic location as a percentage of total fees for services provided to joint ventures during fiscal 2025 and fiscal 2024, respectively, were as follows:

	Fiscal 2025		% of Total Fees for Services Provided to Joint Ventures			Fiscal 2024		% of Total Fees for Services Provided to Joint Ventures
Germany	$	846,281		16.9	%	$	828,932		15.8	%
Poland		840,467		16.8	%		849,736		16.2	%
Japan		647,573		12.9	%		582,674		11.1	%
Finland		411,268		8.2	%		395,515		7.5	%
United Kingdom		404,342		8.1	%		375,150		7.1	%
Thailand		371,175		7.4	%		332,148		6.3	%
Sweden		330,205		6.6	%		445,560		8.5	%
France		320,546		6.4	%		485,627		9.2	%
Czech Republic		303,869		6.1	%		338,195		6.4	%
South Korea		186,669		3.7	%		258,314		4.9	%
Indonesia		137,125		2.7	%		166,053		3.2	%
Other		206,631		4.2	%		193,877		3.7	%
	$	5,006,151		100.0	%	$	5,251,782		100.0	%

Sales to the Company’s joint ventures are included in the foregoing segment and geographic information; however, sales by the Company’s joint ventures to other parties are not included. The foregoing segment and geographic information represents only sales recognized directly by the Company and sold in that geographic territory.

See Note 7 for additional details on geographical information regarding equity in income from joint ventures.

The geographical distribution of total property and equipment and net sales, which are based on the geographical location of the customer, is as follows:

	At August 31, 2025		At August 31, 2024
China	$	5,355,918	$	5,627,202
Other		1,296,988		1,217,400
United States		8,531,012		9,421,051
Total property and equipment	$	15,183,918	$	16,265,653

	Fiscal Year Ended August 31, 2025		Fiscal Year Ended August 31, 2024
China	$	16,239,889	$	14,245,238
Brazil		6,570,850		5,994,372
India		22,620,639		22,189,317
Other		9,255,207		12,137,925
United States		29,547,889		30,492,665
Total net sales	$	84,234,474	$	85,059,517

Long-lived assets consist of property and equipment. These assets are periodically reviewed to assure the net realizable value from the estimated future production based on forecasted sales exceeds the carrying value of the assets.

All joint venture operations, including equity in income, fees for services and related dividends, are primarily related to ZERUST®products and services.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Award Timing Disclosure	12 Months Ended
Award Timing Disclosure	Aug. 31, 2025
Subsequent Event [Table]
Award Timing MNPI Disclosure [Text Block]	Item 11. EXECUTIVE COMPENSATION The information in the “Director Compensation” and “Executive Compensation” sections of NTIC’s definitive proxy statement to be filed with the Securities and Exchange Commission with respect to NTIC’s next annual meeting of stockholders, which involves the election of directors, is incorporated in this annual report on Form 10-K by reference.
MNPI Disclosure Timed for Compensation Value [Flag]	true

Note 10 - Net Income Per Common Share

12 Months Ended

Aug. 31, 2025

Earnings Per Share [Text Block]

10.

NET INCOME PER COMMON SHARE

Basic net income per common share is computed by dividing net income by the weighted average number of common shares outstanding. Diluted net income per share assumes the exercise of stock options using the treasury stock method, if dilutive.

The following is a reconciliation of the net income per share computation for fiscal 2025 and fiscal 2024:

Numerator:	August 31, 2025		August 31, 2024
Net income attributable to NTIC	$	17,619	$	5,409,082

Denominator:
Basic-weighted shares outstanding		9,476,085		9,434,020
Weighted shares assumed upon exercise of stock options		163,592		399,430
Diluted – weighted shares outstanding		9,639,676		9,833,450

Basic net income per share:	$	0.00	$	0.57
Diluted net income per share:	$	0.00	$	0.55

The dilutive impact summarized above relates to the periods when the average market price of the Company’s common stock exceeded the exercise price of the potentially dilutive option securities granted. Net income per common share was based on the weighted average number of common shares outstanding during the periods when computing the basic net income per share. When dilutive, stock options are included as equivalents using the treasury stock market method when computing the diluted net income per share. Excluded from the computation of diluted net income per share as of August 31, 2025 were options outstanding to purchase 1,833,783 shares of common stock. Excluded from the computation of diluted net income per share as of August 31, 2024 were options outstanding to purchase 305,514 shares of common stock.

Note 11 - Stock-based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Aug. 31, 2025 $ / shares shares
RSU outstanding, shares (in shares) \| shares	0
RSU outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 0
RSU granted, shares (in shares) \| shares	11,313
RSU granted, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 13.26
RSU vested/settled, shares (in shares) \| shares	0
RSU vested/settled, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 0
RSU outstanding, shares (in shares) \| shares	11,313
RSU outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 13.26

Note 3 - Accounting Pronouncements

12 Months Ended

Aug. 31, 2025

Accounting Standards Update and Change in Accounting Principle [Text Block]

3.	ACCOUNTING PRONOUNCEMENTS

Recently Issued Accounting Pronouncements

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The new guidance is expected to improve income tax disclosures primarily related to the rate reconciliation and income taxes paid information by requiring 1) consistent categories and greater disaggregation of information in the rate reconciliation and 2) income taxes paid disaggregated by jurisdiction. The guidance is effective on a prospective basis, although retrospective application and early adoption is permitted. The Company is evaluating its disclosure approach for ASU 2023-09 and anticipates adopting the standard for the annual period starting September 1, 2025.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, which requires disaggregation of certain costs in a separate note to the financial statements, such as the amounts of employee compensation, depreciation and intangible asset amortization, included in each relevant expense caption in annual and interim consolidated financial statements. ASU 2024-03 is effective for annual periods beginning after December 15, 2026 and for interim periods beginning after December 15, 2027 on a retrospective or prospective basis, with early adoption permitted. The Company is evaluating the effect that ASU 2024-03 will have on its consolidated financial statement disclosures.

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

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-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479654/326-10-65-4

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (e)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479654/326-10-65-4

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480530/250-10-S99-6

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (f)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 250
-Publisher FASB
-URI https://asc.fasb.org/250/tableOfContent

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

Note 5 - Property and Equipment, Net

12 Months Ended

Aug. 31, 2025

Property, Plant and Equipment Disclosure [Text Block]

5.	PROPERTY AND EQUIPMENT, NET

Property and equipment, net consisted of the following:

	August 31, 2025			August 31, 2024
Land	$	1,260,312		$	1,238,180
Buildings and improvements		14,650,361			14,760,250
Construction in process		817,946			3,086,479
Machinery and equipment		9,154,728			7,276,151
		25,883,347			26,361,060
Less accumulated depreciation		(10,699,429	)		(10,095,407	)
	$	15,183,918		$	16,265,653

Depreciation expense was $979,981 for fiscal 2025 compared to $1,156,364 in fiscal 2024. Assets in process includes capitalized software costs incurred until the capitalized software is placed in service. Once placed in service, these costs are reclassed to intangible assets, net in the consolidated balance sheet.

Note 11 - Stock-based Compensation

12 Months Ended

Aug. 31, 2025

Share-Based Payment Arrangement [Text Block]

11.

STOCK-BASED COMPENSATION

Stock Options

The Company has four stock-based compensation plans under which stock options or other stock-based awards have been granted: the Northern Technologies International Corporation 2024 Stock Incentive Plan, the Northern Technologies International Corporation Amended and Restated 2019 Stock Incentive Plan, the Northern Technologies International Corporation Amended and Restated 2007 Stock Incentive Plan (the 2007 Plan) and the Northern Technologies International Corporation Employee Stock Purchase Plan. The 2024 Plan replaced the 2019 Plan with respect to future award grants, which had replaced the 2007 Plan with respect to future grants; and, therefore, no further awards may be made under the 2019 Plan or 2007 Plan. The Compensation Committee of the Board of Directors and the Board of Directors administer these plans.

The 2024 Plan provides for the grant of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock, stock unit awards, performance awards, and stock bonuses to eligible recipients to enable the Company and its subsidiaries to attract and retain qualified individuals through opportunities for equity participation in the Company and to reward those individuals who contribute to the achievement of the Company’s economic objectives. Subject to adjustment as provided in the 2024 Plan, the maximum number of shares of the Company’s common stock available for issuance under the 2024 Plan is (i) 800,000 shares of the Company’s common stock; plus (ii) the number of shares of the Company’s common stock remaining available for issuance under the 2019 Plan but not subject to outstanding awards under the 2019 Plan as of January 19, 2024; plus (iii) the number of additional shares of the Company’s common stock subject to awards outstanding under the 2019 Plan as of January 19, 2024 but only to the extent that such outstanding awards are forfeited, cancelled, expire, or otherwise terminate without the issuance of such shares of the Company’s common stock after January 19, 2024. Options granted generally have a term of ten years and become exercisable over a one- or three-year period beginning on the one-year anniversary of the date of grant. Options are granted at per share exercise prices equal to the market value of the Company’s common stock on the date of grant. The Company issues new shares upon the exercise of options. As of August 31, 2025, options to purchase an aggregate of 245,190 shares of the Company’s common stock were outstanding under the 2024 Plan and 700,556 shares of the Company’s common stock remained available for grant under the 2024 Plan. As of August 31, 2025, options to purchase an aggregate of 1,387,415 shares of the Company’s common stock were outstanding under the 2019 Plan, and 290,533 shares of the Company’s common stock were outstanding under the 2007 Plan.

The Company granted options to purchase an aggregate of 245,190 and 269,844 shares of its common stock during fiscal 2025 and 2024, respectively. The fair value of option grants is determined at the date of grant using the Black-Scholes option pricing model with the assumptions listed below. The Company recognized compensation expense of $1,211,434 during fiscal 2025 and compensation expense of $1,381,169 during fiscal 2024 related to the options that vested during such time period. As of August 31, 2025, the total compensation cost for non-vested options not yet recognized in the Company’s consolidated statements of operations was $1,010,384. Stock-based compensation expense of $672,054 is expected during fiscal 2026 and $338,330 is expected to be recognized during fiscal 2027, based on outstanding options as of August 31, 2025. Future option grants will impact the compensation expense recognized. Stock-based compensation expense is included in general and administrative expense on the consolidated statements of operations.

The fair value of each option grant is estimated on the grant date using the Black-Scholes option pricing model with the following assumptions and results for the grants:

	Fiscal Year 2025			Fiscal Year 2024
Dividend yield		2.15	%		2.18	%
Expected volatility		47.4	%		46.1	%
Expected life of option (years)	5			5
Weighted average risk-free interest rate		3.66	%		4.23	%

Stock option activity during the periods indicated was as follows:

	Number of Shares (#)			Weighted Average Exercise Price		Aggregate Intrinsic Value
Outstanding as of August 31, 2023		1,557,132		$	11.08
Options granted		269,844			13.25
Options exercised		(74,309	)		9.76
Options terminated		—			—

Outstanding as of August 31, 2024		1,752,665		$	11.47
Options granted		245,190			13.26
Options exercised		(12,000	)		7.43
Options terminated		(62,717	)		7.43

Outstanding as of August 31, 2025		1,923,138		$	11.86	$	62,547

Exercisable as of August 31, 2025		1,476,274		$	11.52	$	62,547

The weighted average per share fair value of options granted during fiscal 2025 and fiscal 2024 was $5.07 and $5.04, respectively. The weighted average remaining contractual life of the options outstanding as of August 31, 2025 and 2024 was 5.74 years and 6.03 years, respectively.

Restricted Stock Units

Restricted stock units were granted under the 2024 Plan on September 1, 2024 to certain non-employee directors during the year ended August 31, 2025 and vest in full on the one-year anniversary of the date of grant. There were no restricted stock units granted or outstanding during the fiscal year ended August 31, 2024. A summary of restricted stock unit activity for the year ended August 31, 2025 is as follows:

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value
Outstanding as of August 31, 2024		—	$	—
Granted		11,313		13.26
Vested/Settled		—		—

Outstanding as of August 31, 2025		11,313	$	13.26

Restricted stock units are valued using the closing stock price on the grant date. The Company recognizes the grant date fair value of the restricted stock units over the vesting term, or one year. For the year ended August 31, 2025, the Company recognized $148,652 in stock-based compensation expense. As of August 31, 2025, there was no unrecognized stock-based compensation expense relating to outstanding restricted stock units.

Note 8 - Corporate Debt (Details Textual)	Aug. 30, 2025 USD ($)	Aug. 30, 2025 INR (₨)	Jan. 06, 2025	Aug. 31, 2025 USD ($)	Aug. 31, 2025 INR (₨)	Aug. 30, 2025 INR (₨)	May 29, 2025 USD ($)	May 29, 2025 CNY (¥)	Aug. 31, 2024 USD ($)	May 31, 2024	Jan. 06, 2023 USD ($)
NTIC China [Member] \| Term Loan in May [Member]
Debt Instrument, Face Amount							$ 1,390,000	¥ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage				2.96%	2.96%
Long-Term Debt				$ 2,804,695					$ 2,820,835
NTIC China [Member] \| Term Loan in April [Member]
Debt Instrument, Interest Rate, Stated Percentage				2.75%	2.75%
IDFC First Bank Limited [Member] \| Natur-Tec India [Member] \| Foreign Currency Term Loan Agreement [Member]
Debt Instrument, Face Amount	$ 600,000					₨ 50,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.45%					6.45%
Long-Term Debt				$ 522,545	₨ 46,100,000
Proceeds from Issuance of Debt	$ 522,545	₨ 46,100,000
Debt Instrument, Repayments, Number of Monthly Installments	85					85
Debt Instrument, Periodic Payment	$ 7,899
Debt Instrument, Collateral, Lien on Cash Deposits	$ 539,731					₨ 47,600,000
Long-Term Debt, Current Maturities				55,561	6,170,000
Long-Term Debt, Excluding Current Maturities				$ 466,984	₨ 39,930,000
Revolving Credit Facility [Member] \| JP Morgan Chase Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity											$ 10,000,000
Long-Term Line of Credit									$ 9,329,021
CB Floating Rate Floor			2.50%
Line of Credit Facility, Interest Rate at Period End				6.61%	6.61%					7.44%
Debt Instrument, Covenants, Fixed Charge Coverage Ratio			1.25
Revolving Credit Facility [Member] \| JP Morgan Chase Bank [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			0.10%
Revolving Credit Facility [Member] \| JP Morgan Chase Bank [Member] \| Adjusted SOFR Rate Applicable Margin [Member]
Debt Instrument, Basis Spread on Variable Rate			2.35%
Standby Letters of Credit [Member] \| JP Morgan Chase Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity											$ 5,000,000

Note 1 - Nature of Business and Significant Accounting Policies (Tables)

12 Months Ended

Aug. 31, 2025