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Note 14 - Commitments and Contingencies (Details) (USD $)
6 Months Ended
Feb. 28, 2015
Aug. 31, 2014
Feb. 28, 2014
Note 14 - Commitments and Contingencies (Details) [Line Items]      
Accrued Bonuses (in Dollars) 100,000us-gaap_AccruedBonusesCurrentAndNoncurrent   $ 620,000us-gaap_AccruedBonusesCurrentAndNoncurrent
Entity-Wide Trade Joint Venture Receivables, Two Joint Ventures, Percentage 37.80%ntic_EntityWideTradeJointVentureReceivablesTwoJointVenturesPercentage    
Entity-Wide Trade Joint Venture Receivables, Three Joint Ventures, Percentage   62.90%ntic_EntityWideTradeJointVentureReceivablesThreeJointVenturesPercentage  
Fiscal 2013 Bonus Plan [Member] | Executive Officer [Member]      
Note 14 - Commitments and Contingencies (Details) [Line Items]      
Percentage of Individual Bonus Payout Determined By Actual Versus Targeted EBITOI Results 75.00%ntic_PercentageOfIndividualBonusPayoutDeterminedByActualVersusTargetedEBITOIResults
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= ntic_Fiscal2013BonusPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Percentage of Individual's Payout Determined Upon Achievement of Certain Pre-Established Individual Performance Objectives 25.00%ntic_PercentageOfIndividualsPayoutDeterminedUponAchievementOfCertainPreEstablishedIndividualPerformanceObjectives
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= ntic_Fiscal2013BonusPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember