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Note 6 - Investments in Joint Ventures (Details) (USD $)	6 Months Ended		3 Months Ended	0 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Nov. 30, 2013	Nov. 30, 2013	Aug. 31, 2014
Note 6 - Investments in Joint Ventures (Details) [Line Items]
Payments to Acquire Interest in Joint Venture	$ 0us-gaap_PaymentsToAcquireInterestInJointVenture	$ 0us-gaap_PaymentsToAcquireInterestInJointVenture
Mutec [Member]
Note 6 - Investments in Joint Ventures (Details) [Line Items]
Other than Temporary Impairment Losses, Investments			50,000us-gaap_ImpairmentOfInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_MutecMember
Due from Joint Ventures	142,277us-gaap_DueFromJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_MutecMember				156,854us-gaap_DueFromJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_MutecMember
Mutec [Member]
Note 6 - Investments in Joint Ventures (Details) [Line Items]
Financing Receivable, Net			$ 168,000us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = ntic_MutecMember	$ 168,000us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = ntic_MutecMember
Notes Receivable, Term				4 years

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For an unclassified balance sheet, amounts due from an entity in which the reporting entity shares joint control with another party or group.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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