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Note 7 - China Operations (Details) - Investment in Tianjin Zerust (Tianjin Zerust [Member], USD $)	6 Months Ended
	Feb. 28, 2015	Aug. 31, 2014
Tianjin Zerust [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment – August 31, 2014		$ 2,243,524us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Equity in earnings – six months ended February 28, 2015	132,824us-gaap_TemporaryEquityInterestInSubsidiaryEarnings / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Reclassification of translation gains on foreign currency translation	(492,660)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember
Investment at carrying value – February 28, 2015	$ 1,883,688us-gaap_InvestmentOwnedAtFairValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_TianjinZerustMember

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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- Definition

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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Subsidiary earnings portion attributable to temporary equity.

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No definition available.

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