Consolidated Balance Sheets (Unaudited) Consolidated Balance Sheets (Unaudited) [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 February 28, 2013 and August 31, 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 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 7) COMMITMENTS AND CONTINGENCIES (Note 13) EQUITY: EQUITY: [Abstract] Common stock, $0.02 par value per share; authorized 10,000,000 shares; issued and outstanding 4,418,821 and 4,403,656, respectively Additional paid-in capital Retained earnings Accumulated other comprehensive income Stockholders’ equity Non-controlling interest Total equity Total liabilities and equity Trade, allowance (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 Consolidated Statements of Operations (Unaudited) Consolidated Statements of Operations (Unaudited) [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 PER COMMON SHARE: NET INCOME 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) Consolidated Statements of Comprehensive Income (Unaudited) Consolidated Statements of Comprehensive Income (Unaudited) [Abstract] NET INCOME OTHER COMPREHENSIVE INCOME (LOSS) – FOREIGN CURRENCY TRANSLATION ADJUSTMENT COMPREHENSIVE INCOME (LOSS) COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO STOCKHOLDERS Consolidated Statements of Cash Flows (Unaudited) Consolidated Statements of Cash Flows (Unaudited) [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 from joint ventures Changes in current assets and liabilities: Changes in current assets and liabilities: [Abstract] 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 receivables, 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] 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 PERIOD CASH AND CASH EQUIVALENTS AT END OF PERIOD Note 1 - Interim Financial Information Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Note 2 - NTI ASEAN Business Combination Disclosure [Text Block] Note 3 - Inventories Inventory Disclosure [Text Block] Note 4 - Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Note 5 - Patents and Trademarks, Net Intangible Assets Disclosure [Text Block] Note 6 - Investments in Joint Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Note 7 - Corporate Debt Debt Disclosure [Text Block] Note 8 - Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Note 9 - Net Income Per Common Share Earnings Per Share [Text Block] Note 10 - Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Note 11 - Geographic And Segment Information Segment Reporting Disclosure [Text Block] Note 12 - Research and Development Research, Development, and Computer Software Disclosure [Text Block] Note 13 - Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Purchase Price Allocation [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Schedule of Inventory, Current [Table Text Block] Property, Plant and Equipment [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Condensed Balance Sheet [Table Text Block] Schedule of Condensed Income Statement [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Income Statement Location [Domain] 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 Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Reconciliation of Cost of Good Sold from Segments to Consolidated [Table Text Block] Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Allocation of the total transaction amount: Allocation of the total transaction amount: [Abstract] Net assets acquired (liabilities assumed): Net assets acquired (liabilities assumed): [Abstract] Cash and cash equivalents Accounts receivables The value of investments in joint ventures acquired in a business combination. Investments in joint ventures Value of assets Purchase price: Purchase price: [Abstract] Fair value of non-controlling interest Value of previously held interest Total consideration Pro Forma Effects of Consolidation of NTI Asean on the Company's Consolidated Financial Statements as of the Beginning of the Period For the Three Months Ended November 30, 2011: Pro Forma Effects of Consolidation of NTI Asean on the Company's Consolidated Financial Statements as of the Beginning of the Period For the Three Months Ended November 30, 2011: [Abstract] Scenario, Unspecified [Domain] Net sales Gross profit Joint venture operations Operating expenses Operating income Income before income tax expense