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Note 15 - Subsequent Event (Details) (USD $)	9 Months Ended	3 Months Ended
	Aug. 31, 2015	Nov. 30, 2014
Scenario, Forecast [Member] | NTIC China [Member]
Note 15 - Subsequent Event (Details) [Line Items]
Investments in Wholly Owned Subsidiary	$ 1,500,000ntic_InvestmentsInWhollyOwnedSubsidiary / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_NTICChinaMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
NTIC China [Member]
Note 15 - Subsequent Event (Details) [Line Items]
Investments in Wholly Owned Subsidiary		500,000ntic_InvestmentsInWhollyOwnedSubsidiary / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ntic_NTICChinaMember
Minimum [Member] | Termination of Joint Venture and Formation of NTIC China [Member]
Note 15 - Subsequent Event (Details) [Line Items]
Professional Fees		$ 225,000us-gaap_ProfessionalFees / us-gaap_NatureOfExpenseAxis = ntic_TerminationOfJointVentureAndFormationOfNTICChinaMember / us-gaap_RangeAxis = us-gaap_MinimumMember

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- Definition

The amount invested in the company's wholly owned subsidiary to serve as working capital for the subsidiary.

+ References

No definition available.

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- Definition

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section 45

-Paragraph 3

-Subparagraph (k)

-URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849

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