Statement of Financial Position [Abstract] ASSETS ASSETS [Abstract] CURRENT ASSETS: CURRENT ASSETS: [Abstract] Cash and cash equivalents Receivables: Receivables: [Abstract] 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. Trade excluding joint ventures, less allowance for doubtful accounts of $20,000 at August 31, 2013 and 2012 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. Trade 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). Fees for services provided to joint ventures Income taxes Inventories Prepaid expenses Deferred income taxes Total current assets PROPERTY AND EQUIPMENT, net OTHER ASSETS: OTHER ASSETS: [Abstract] Investments in joint ventures Deferred income taxes Patents and trademarks, net Other Total other assets Total assets LIABILITIES AND EQUITY LIABILITIES AND EQUITY [Abstract] CURRENT LIABILITIES: CURRENT LIABILITIES: [Abstract] Current portion of note payable (Note 8) Accounts payable Accrued liabilities: Accrued liabilities: [Abstract] Payroll and related benefits Deferred joint venture royalties Other Total current liabilities NOTE PAYABLE, NET OF CURRENT PORTION (Note 8) COMMITMENTS AND CONTINGENCIES (Note 16) EQUITY: EQUITY: [Abstract] Preferred stock, no par value; authorized 10,000 shares; none issued and outstanding Common stock, $0.02 par value per share; authorized 10,000,000 shares; issued and outstanding 4,432,036 and 4,421,636, respectively Additional paid-in capital Retained earnings Accumulated other comprehensive income Stockholders’ equity Non-controlling interests Total equity Total liabilities and equity Trade excluding joint ventures, allowance for doubtful accounts (in Dollars) Preferred stock, par value (in Dollars per share) Preferred stock, shares authorized Preferred stock, shares issued Preferred stock, shares outstanding Common stock par value (in Dollars per share) Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Income Statement [Abstract] NET SALES: NET SALES: [Abstract] Net sales either directly to end users or to distributors worldwide, but not sales to the reporting entity's joint ventures and not sales by the reporting entity's joint ventures. Net sales, excluding joint ventures Net sales by the reporting entity to the reporting entity's joint ventures, but not sales by the reporting entity either directly to end users or to distributors or sales by the reporting entity’s joint ventures. Net sales, to joint ventures Total net sales Cost of goods sold Gross profit JOINT VENTURE OPERATIONS: JOINT VENTURE OPERATIONS: [Abstract] Equity in income of joint ventures Royalties and service fees from transactions directly with the reporting entity's joint ventures outside the normal course of business. Fees for services provided to joint ventures Total joint venture operations OPERATING EXPENSES: OPERATING EXPENSES: [Abstract] Selling expenses General and administrative expenses Expenses incurred in support of joint ventures Research and development expenses Total operating expenses OPERATING INCOME INTEREST INCOME INTEREST EXPENSE OTHER INCOME INCOME BEFORE INCOME TAX EXPENSE INCOME TAX EXPENSE NET INCOME NET INCOME ATTRIBUTABLE TO NON-CONTROLLING INTEREST NET INCOME ATTRIBUTABLE TO NTIC NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE: NET INCOME ATTRIBUTABLE TO NTIC PER COMMON SHARE: [Abstract] Basic (in Dollars per share) Diluted (in Dollars per share) WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING: WEIGHTED AVERAGE COMMON SHARES ASSUMED OUTSTANDING: [Abstract] Basic (in Shares) Diluted (in Shares) Statement of Comprehensive Income [Abstract] NET INCOME NET INCOME [Abstract] OTHER COMPREHENSIVE INCOME (LOSS) – FOREIGN CURRENCY TRANSLATION ADJUSTMENT COMPREHENSIVE INCOME (LOSS) COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO NON-CONTROLLING INTERESTS COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO NTIC Statement of Stockholders' Equity [Abstract] Equity Component [Domain] BALANCE BALANCE BALANCE (in Shares) BALANCE (in Shares) Stock issued in lieu of accrued payroll Stock issued in lieu of accrued payroll (in Shares) Exercise of stock options Exercise of stock options (in Shares) Stock issued for employee stock purchase plan Stock issued for employee stock purchase plan (in Shares) Stock option expense Comprehensive Income Effect of Asean Consolidation (Note 3) Dividend received by non-controlling interest Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: CASH FLOWS FROM OPERATING ACTIVITIES: [Abstract] Net income Adjustments to reconcile net income to net cash used in operating activities: Adjustments to reconcile net income to net cash used in operating activities: [Abstract] Expensing of fair value of stock options vested Depreciation expense Amortization expense Loss on disposal of assets Equity in income of joint ventures Deferred income taxes Receivables: Receivables: [Abstract]0 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. Trade, excluding 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. Trade, 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. Fees for services provided to joint ventures Income taxes Inventories Prepaid expenses and other Accounts payable Income tax payable Accrued liabilities Net cash used in operating activities CASH FLOWS FROM INVESTING ACTIVITIES: CASH FLOWS FROM INVESTING ACTIVITIES: [Abstract] Investment in joint ventures Dividends received from joint ventures Additions to property and equipment Effect of NTI Asean consolidation on cash (Note 2) Additions to patents Net cash provided by investing activities CASH FLOWS FROM FINANCING ACTIVITIES: CASH FLOWS FROM FINANCING ACTIVITIES: [Abstract] Repayment of note payable Dividend received by non-controlling interest Proceeds from employee stock purchase plan Proceeds from exercise of stock options Net cash provided by financing activities EFFECT OF EXCHANGE RATE CHANGES ON CASH: NET INCREASE IN CASH AND CASH EQUIVALENTS CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR CASH AND CASH EQUIVALENTS AT END OF YEAR Disclosure Text Block [Abstract] Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Table Text Block [Abstract] Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Business Combinations [Abstract] Business Combination Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment Disclosure [Text Block] Intangible Assets Disclosure [Text Block] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures Disclosure [Text Block] Debt Disclosure [Abstract] Debt Disclosure [Text Block] Stockholders' Equity Note [Abstract] Stockholders' Equity Note Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Share [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Compensation and Retirement Disclosure [Abstract] Pension and Other Postretirement Benefits Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Supplemental Cash Flow Elements [Abstract] Cash Flow, Supplemental Disclosures [Text Block] Fair Value, Measurement Inputs, Disclosure [Text Block] Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information [Text Block] Accounting Policies [Abstract] Business Description and Basis of Presentation [Text Block] Consolidation, Policy [Policy Text Block] Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Revenue Recognition, Deferred Revenue [Policy Text Block] Receivables, Policy [Policy Text Block] Receivables from Joint Ventures, Policy [Policy Text Block]