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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
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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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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