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Note 11 - Geographic and Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales (Sales Revenue, Net [Member], Geographic Concentration Risk [Member])	3 Months Ended
	Nov. 30, 2014	Nov. 30, 2013
Note 11 - Geographic and Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]
Net Sales, Percentage	100.00%us-gaap_ConcentrationRiskPercentage1	100.00%us-gaap_ConcentrationRiskPercentage1
Inside the U.S.A to Unaffiliated Customers [Member]
Note 11 - Geographic and Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]
Net Sales, Percentage	67.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementScenarioAxis = ntic_InsideTheUSAToUnaffiliatedCustomersMember	71.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementScenarioAxis = ntic_InsideTheUSAToUnaffiliatedCustomersMember
Joint Ventures In Which The Company Is A Shareholder Directly And Indirectly - Outside the U.S.A [Member]
Note 11 - Geographic and Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]
Net Sales, Percentage	11.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementScenarioAxis = ntic_JointVenturesInWhichTheCompanyIsAShareholderDirectlyAndIndirectlyOutsideTheUSAMember	10.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementScenarioAxis = ntic_JointVenturesInWhichTheCompanyIsAShareholderDirectlyAndIndirectlyOutsideTheUSAMember
Unaffiliated Customers - Outside the U.S.A [Member]
Note 11 - Geographic and Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]
Net Sales, Percentage	21.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementScenarioAxis = ntic_UnaffiliatedCustomersOutsideTheUSAMember	18.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementScenarioAxis = ntic_UnaffiliatedCustomersOutsideTheUSAMember

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



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-Topic 275

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