Document And Entity Information Fiscal 2026 Fiscal 2027 Note To Financial Statement Details Textual Fiscal 2028 Note 3 - Inventories Note 4 - Property and Equipment, Net Note 5 - Intangible Assets, Net Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Note 6 - Investments in Joint Ventures Note 8 - Stockholders' Equity Fiscal 2025 Note 9 - Net Income Per Common Share LONG-TERM LIABILITIES: Note 10 - Stock-based Compensation Note 11 - Segment and Geographic Information Note 13 - Supplemental Cash Flow Information Income Tax Disclosure [Text Block] Note 3 - Inventories - Inventories (Details) Note 4 - Property and Equipment, Net - Components of Property and Equipment, Net (Details) Note 5 - Intangible Assets, Net - Intangible Assets, Net (Details) us-gaap_ShareBasedCompensation Stock-based compensation Note 5 - Intangible Assets, Net - Future Amortization Expense (Details) Current liabilities Total current liabilities Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) ntic_ForeignWithholdingTax Foreign Withholding Tax The amount of foreign withholding tax. Inside the USA to Unaffiliated Customers [Member] Inside the USA to Unaffiliated Customers. Note 8 - Stockholders' Equity - Dividends Declared (Details) Joint Ventures in Which the Company is a Shareholder Directly and Indirectly Outside the USA [Member] Joint ventures in which the company is a shareholder directly and indirectly outside the USA [member] Unaffiliated Customers Outside the USA [Member] Unaffiliated customers outside the USA [member] Note 9 - Net Income Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) Net sales Net sales Amortization expense us-gaap_AdjustmentForAmortization NTIC’s share of joint ventures’ undistributed earnings Note 10 - Stock-based Compensation - Stock Option Activity (Details) Note 11 - Segment and Geographic Information - Net Sales by Segment (Details) OPERATING EXPENSES: Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) Note 11 - Segment and Geographic Information - Net Sales by Geographic Location (Details) Share-Based Payment Arrangement, Option, Activity [Table Text Block] Note 11 - Segment and Geographic Information - Total Long-lived Assets by Geographic Distribution (Details) Note 11 - Segment and Geographic Information - Total Net Sales by Geographic Distribution (Details) Poland Total fees for services provided to joint ventures by geographic locations. Note 13 - Supplemental Cash Flow Information - Supplemental Disclosures of Cash Flow Information (Details) Notes To Financial Statements Schedule of Finite-Lived Intangible Assets [Table Text Block] Notes To Financial Statements [Abstract] OTHER COMPREHENSIVE (LOSS) INCOME – FOREIGN CURRENCY TRANSLATION ADJUSTMENT us-gaap_Depreciation Depreciation expense ntic_EntityWideFeesForServicesProvidedToJointVenturesGeographicPercentage Poland Percentage of entity wide fees for services provided to joint ventures generated from geographic location. Intangible Assets Disclosure [Text Block] Other comprehensive income (loss) Current assets Total current assets Equity [Text Block] us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest Total equity BALANCE BALANCE Line of credit us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Income taxes Dividend receivable from joint venture Represents the amount of dividend receivable from joint venture. Common stock, $0.02 par value per share; authorized 15,000,000 shares as of February 29, 2024 and August 31, 2023; issued and outstanding 9,427,598 and 9,424,101, respectively ntic_IncreaseDecreaseInDividendsReceivableFromJointVenture Dividends receivable from joint venture The net change during the reporting period in amount due within one year (or one business cycle) from joint ventures for dividends receivable outside of the normal course of business. Adjustments to reconcile net income to net cash provided by operating activities: Term loan us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Outstanding, weighted average exercise price (in dollars per share) Outstanding, weighted average exercise price (in dollars per share) us-gaap_CommonStockSharesAuthorized Common Stock, Shares Authorized (in shares) Cancelled, weighted average exercise price (in dollars per share) us-gaap_CommonStockSharesIssued Common Stock, Shares, Issued (in shares) us-gaap_CommonStockParOrStatedValuePerShare Common Stock, Par or Stated Value Per Share (in dollars per share) Options granted, weighted average exercise price (in dollars per share) Options exercised, weighted average exercise price (in dollars per share) Payroll and related benefits Income taxes payable Term Loan in May [Member] Represents term loan in May. Term Loan in April [Member] Represents term loan in April. Accounts payable Revolving Credit Facility [Member] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Outstanding, shares (in shares) Outstanding, shares (in shares) ZERUST [Member] Represents ZERUST. Product and Service [Axis] NaturTec [Member] Represents NaturTec segment. Product and Service [Domain] Investment, Name [Domain] Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block] Tabular disclosure of all significant reconciling items in the reconciliation of total cost of goods sold from reportable segments to the entity's consolidated revenues. Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment Proceeds from sale of property and equipment Credit Facility [Axis] Preferred stock, no par value; authorized 10,000 shares; none issued and outstanding Credit Facility [Domain] Cost of Goods Sold Type [Axis] Cost of goods sold type [axis] Other Cost of Goods Sold Type [Domain] us-gaap_PreferredStockSharesIssued Preferred Stock, Shares Issued (in shares) Direct Cost of Goods Sold [Member] Direct cost of goods sold [member] Indirect Cost of Goods Sold [Member] Indirect cost of goods sold [member] Cash paid for interest us-gaap_PolicyTextBlockAbstract Accounting Policies Prepaid expenses Investment, Name [Axis] Cost of goods sold, percentage Represents cost of goods sold as percentage of product sales. Cash Flow, Supplemental Disclosures [Text Block] us-gaap_PreferredStockNoParValue Preferred Stock, No Par Value (in dollars per share) Property, Plant and Equipment Disclosure [Text Block] Geographical [Axis] Geographical [Domain] Property, Plant and Equipment [Table Text Block] us-gaap_PreferredStockSharesAuthorized Preferred Stock, Shares Authorized (in shares) JOINT VENTURE OPERATIONS: Joint venture operations us-gaap_InventoryNet Inventory, Net Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Other Countries [Member] Countries identified as "Other". ntic_EntityWideTradeJointVentureReceivablesThreeJointVenturesPercentage Entity Wide Trade Joint Venture Receivables, Three Joint Ventures, Percentage Percentage of total trade joint venture receivables accounted for by three joint ventures. ntic_EntityWideTradeJointVentureReceivablesTwoJointVenturesPercentage Entity Wide Trade Joint Venture Receivables, Two Joint Ventures, Percentage Percentage of total trade joint venture receivables accounted for by two joint ventures. us-gaap_PaymentsToAcquireIntangibleAssets Investments in patents us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchases of property and equipment us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements Weighted shares assumed upon exercise of stock options (in shares) Accrued liabilities: Inventories WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING: us-gaap_ProceedsFromDividendsReceived Dividends received from joint ventures CURRENT LIABILITIES: Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Total assets Total assets Plan Name [Axis] Plan Name [Domain] Non-controlling interests CASH FLOWS FROM OPERATING ACTIVITIES: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Customer Relationships [Member] Statement [Line Items] us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent Accounts Receivable, Allowance for Credit Loss, Current us-gaap_NumberOfReportableSegments 2 Receivables: Deferred income tax, net us-gaap_DeferredIncomeTaxAssetsNet NET SALES: Stock option expense Finite-Lived Intangible Assets by Major Class [Axis] Share-Based Payment Arrangement [Text Block] Finite-Lived Intangible Assets, Major Class Name [Domain] Additional paid-in capital AOCI Attributable to Parent [Member] Segment Reporting Disclosure [Text Block] us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders Dividend received by non-controlling interest CURRENT ASSETS: INTEREST INCOME EXCOR and All Other Joint Venturs [Member] Represents EXCOR and All Other Joint Venturs. ntic_AssetsNoncurrentOtherThanPropertyPlantAndEquipment Total other assets Sum of the carrying amounts as of the balance sheet date of all assets, excluding property, plant, and equipment that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer. us-gaap_NetIncomeLoss NET INCOME ATTRIBUTABLE TO NTIC Net income us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization Accumulated Amortization Patents and trademarks Net Carrying Amount Intangible asset, net Patents and trademarks Total us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD CASH AND CASH EQUIVALENTS AT END OF PERIOD Standby Letters of Credit [Member] us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS Gross Carrying Amount Patents and trademarks OTHER ASSETS: NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTERESTS us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities Commitments and Contingencies us-gaap_OperatingIncomeLoss OPERATING INCOME us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Share-Based Payment Arrangement, Option [Member] us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities Antidilutive Securities [Axis] us-gaap_GrossProfit Gross profit Gross profit Antidilutive Securities, Name [Domain] Cost of goods sold Deferred income tax, net us-gaap_DeferredIncomeTaxLiabilitiesNet us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest COMPREHENSIVE LOSS ATTRIBUTABLE TO NON-CONTROLLING INTERESTS EQUITY: us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Less accumulated depreciation Commitments and Contingencies Disclosure [Text Block] PROPERTY AND EQUIPMENT, NET Property, Plant and Equipment, Net Property, plant, and equipment Goodwill us-gaap_PropertyPlantAndEquipmentGross Property, Plant and Equipment, Gross us-gaap_MachineryAndEquipmentGross Machinery and equipment Consolidated Entities [Axis] Consolidated Entities [Domain] us-gaap_Land Land us-gaap_Dividends Dividends paid to shareholders us-gaap_BuildingsAndImprovementsGross Buildings and improvements Condensed Balance Sheet [Table Text Block] Condensed Income Statement [Table Text Block] us-gaap_PaymentsOfDividendsCommonStock Dividends paid on NTIC common stock Equity Method Investments and Joint Ventures Disclosure [Text Block] NET INCOME Net income NET INCOME us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest COMPREHENSIVE INCOME Noncontrolling Interest [Member] CASH FLOWS FROM INVESTING ACTIVITIES: us-gaap_ProceedsFromStockPlans Proceeds from employee stock purchase plan JP Morgan Chase Bank [Member] Represents information regarding the JP Morgan Chase Bank. NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE: Retained Earnings [Member] ntic_CBFloatingRateFloor CB Floating Rate Floor The minimum percentage for CB floating rate. Earnings Per Share [Text Block] Trade, excluding joint ventures, less allowance for doubtful accounts of $533,000 as of February 29, 2024 and August 31, 2023 Amount due from customers or clients, but not joint ventures, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Proceeds from the exercise of stock options Trade, joint ventures Amounts due from joint ventures, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold to joint ventures in the normal course of business. BRAZIL us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable Income tax payable Equity in income from joint ventures Northern Technologies International Corporation’s share of equity in income of joint ventures Equity in income from joint ventures Investments in joint ventures Additional Paid-in Capital [Member] NTIC China [Member] Represents NTIC China. Common Stock [Member] Adjusted SOFR Rate Applicable Margin [Member] Represents applicable margin to Adjusted SOFR rate. Fees for services provided to joint ventures Amounts due for royalties and service fees outside of the normal course of business from entities in which the reporting entity shares joint control with another party or group, due within 1 year (or 1 business cycle). INCOME TAX EXPENSE us-gaap_IncreaseDecreaseInAccruedLiabilities Accrued liabilities Equity Components [Axis] Equity Component [Domain] ntic_FeesForServicesProvidedToJointVentures Fees for services provided to joint ventures Royalties and service fees from transactions directly with the reporting entity's joint ventures outside the normal course of business. Joint Ventures in France [Member] Represents the joint ventures in France. us-gaap_LongTermDebt Long-Term Debt CHINA us-gaap_IncreaseDecreaseInAccountsPayable Accounts payable us-gaap_PaymentsToMinorityShareholders Dividends received by non-controlling interest CZECHIA GERMANY us-gaap_OperatingExpenses Total operating expenses General and administrative expenses us-gaap_LineOfCredit Long-Term Line of Credit FINLAND us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest INCOME BEFORE INCOME TAX EXPENSE Cash and cash equivalents FRANCE UNITED KINGDOM us-gaap_AllocatedShareBasedCompensationExpense Share-Based Payment Arrangement, Expense dei_DocumentQuarterlyReport Document Quarterly Report Entity Incorporation, State or Country Code Amendment Flag Accounting Policies [Abstract] us-gaap_ComprehensiveIncomeNetOfTax COMPREHENSIVE INCOME ATTRIBUTABLE TO NTIC dei_DocumentTransitionReport Document Transition Report dei_CityAreaCode City Area Code dei_EntityInteractiveDataCurrent Entity Interactive Data Current us-gaap_CommonStockDividendsPerShareDeclared CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) INDIA us-gaap_SharesOutstanding BALANCE (in shares) BALANCE (in shares) Security Exchange Name us-gaap_CommonStockSharesOutstanding Common Stock, Shares, Outstanding (in shares) us-gaap_PreferredStockSharesOutstanding Preferred Stock, Shares Outstanding (in shares) Title of 12(b) Security Equity Method Investment, Nonconsolidated Investee [Axis] Current Fiscal Year End Date us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expenses and other Equity Method Investment, Nonconsolidated Investee [Domain] JAPAN Document Fiscal Period Focus ntic_IncreaseDecreaseInTradeReceivablesExcludingJointVentures Trade, excluding joint ventures The net change during the reporting period in amount due within one year (or one business cycle) from customers or clients, but not joint ventures, for the credit sale of goods and services. Document Fiscal Year Focus us-gaap_IncreaseDecreaseInDeferredIncomeTaxes Deferred income taxes ntic_IncreaseDecreaseInTradeReceivablesJointVentures Trade, joint ventures The net change during the reporting period in amount due within one year (or one business cycle) from joint ventures for the credit sale of goods and services that have been delivered or sold to joint ventures in the normal course of business. dei_DocumentPeriodEndDate Document Period End Date ntic_IncreaseDecreaseInFeesReceivableForServicesProvidedToJointVentures Fees for services provided to joint ventures The net change during the reporting period in amount due within one year (or one business cycle) from joint ventures for royalties and service fees outside of the normal course of business. dei_EntityFileNumber Entity File Number KOREA, REPUBLIC OF Entity Emerging Growth Company us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount dei_DocumentType Document Type Entity Small Business dei_EntityShellCompany Entity Shell Company ntic_IncomeFromJointVentureOperations Total joint venture operations Represents the amount of income from joint venture operations recognized during the period. Document Information [Line Items] Document Information [Table] Entity Filer Category Debt Instrument [Axis] dei_EntityCurrentReportingStatus Entity Current Reporting Status Debt Instrument, Name [Domain] Segments [Axis] Segments [Domain] Variable Rate [Domain] us-gaap_IncreaseDecreaseInIncomeTaxesReceivable Income taxes us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Diluted (in shares) Diluted – weighted shares outstanding (in shares) Variable Rate [Axis] Statement of Comprehensive Income [Abstract] Entity Tax Identification Number Entity Central Index Key dei_EntityRegistrantName Entity Registrant Name Entity [Domain] Legal Entity [Axis] Statement [Table] Entity Address, Address Line One Statement of Financial Position [Abstract] Diluted (in dollars per share) Diluted net income per share: (in dollars per share) Basic (in shares) Basic-weighted shares outstanding (in shares) us-gaap_AmortizationOfIntangibleAssets Amortization of Intangible Assets ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Entity Address, City or Town Patents and Trademarks [Member] Represents patents and trademarks. ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Entity Address, Postal Zip Code Basic (in dollars per share) Basic net income per share: (in dollars per share) Entity Address, State or Province Net (payments) proceeds from line of credit ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Material Terms of Trading Arrangement [Text Block] Statement of Cash Flows [Abstract] EXCOR [Member] Represents EXCOR. dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Statement of Stockholders' Equity [Abstract] us-gaap_StockRepurchasedAndRetiredDuringPeriodShares Stock Repurchased and Retired During Period, Shares (in shares) Income Statement [Abstract] All Other [Member] Represents all other joint ventures. POLAND Revenue from External Customers by Geographic Areas [Table Text Block] Intangible Assets Excluding Patents and Trademarks [Member] Represents intangible assets excluding patents and trademarks. us-gaap_IncreaseDecreaseInInventories Inventories Trading Symbol Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Stock issued for employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans SWEDEN dei_LocalPhoneNumber Local Phone Number Stock options exercised (in shares) us-gaap_TableTextBlock Notes Tables Stock issued for employee stock purchase plan us-gaap_GainLossOnDispositionOfAssets1 Loss on disposable of assets us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity Stock options exercised Accounting Standards Update and Change in Accounting Principle [Text Block] ntic_DebtInstrumentCovenantsFixedChargeCoverageRatio Debt Instrument, Covenants, Fixed Charge Coverage Ratio Represents the fixed charge coverage ratio for the debt instrument under the covenant terms. THAILAND Noncurrent liabilities Total long-term liabilities us-gaap_DividendPayableDateToBePaidDayMonthAndYear Payable Date CASH FLOWS FROM FINANCING ACTIVITIES Thereafter Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Options granted, shares (in shares) Dividends Declared [Table Text Block] Cancelled, shares (in shares) Line of Credit Facility, Lender [Domain] us-gaap_DividendsPayableDateOfRecordDayMonthAndYear Record Date us-gaap_InventoryRawMaterialsNetOfReserves Production materials Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Selling expenses Lender Name [Axis] us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and equity us-gaap_InventoryFinishedGoodsNetOfReserves Finished goods UNITED STATES Retained earnings Research and development expenses Accumulated other comprehensive loss Debt Disclosure [Text Block] us-gaap_InterestExpense INTEREST EXPENSE Changes in current assets and liabilities: ntic_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodIncludingCashlessExercises Options exercised, shares (in shares) Number of share options (or share units) exercised during the current period, including cashless exercises. Joint ventures’ equity Stockholders’ equity us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Operating leases, less current portion Inventory Disclosure [Text Block] Schedule of Inventory, Current [Table Text Block] Class of Stock [Axis] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Current portion of operating leases ESPP [Member] Represents Northern Technologies International Corporation Employee Stock Purchase Plan (the ESPP). us-gaap_PaymentsForProceedsFromInvestments Proceeds from the sale of available for sale securities Operating lease right of use assets us-gaap_EquityMethodInvestmentDividendsOrDistributions Northern Technologies International Corporation’s dividends received from joint ventures Fiscal 2024