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Note 10 - Stock-Based Compensation (Details) (USD $)
3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years 10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) 45,067us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 56,373us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Allocated Share-based Compensation Expense, Estimate, Remainder of Fiscal Year $ 351,786ntic_AllocatedShareBasedCompensationExpenseEstimateRemainderOfFiscalYear  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year 179,785ntic_AllocatedShareBasedCompensationExpenseEstimateNextFiscalYear  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two 79,800ntic_AllocatedShareBasedCompensationExpenseEstimateFiscalYearTwo  
Estimated Forfeiture Rate For Stock Options 10.00%ntic_EstimatedForfeitureRateForStockOptions  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 11.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 8.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 9 months 5 years 98 days
Employee Stock Option [Member]    
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Stock or Unit Option Plan Expense 143,897us-gaap_StockOptionPlanExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
127,927us-gaap_StockOptionPlanExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Net of Estimated Forfeitures [Member]    
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Allocated Share-based Compensation Expense, Estimate, Remainder of Fiscal Year $ 611,371ntic_AllocatedShareBasedCompensationExpenseEstimateRemainderOfFiscalYear
/ us-gaap_StatementScenarioAxis
= ntic_NetOfEstimatedForfeituresMember
 
One Year after Date of Grant [Member] | Minimum [Member] | 2007 Plan [Member]    
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
One Year after Date of Grant [Member] | Maximum [Member] | 2007 Plan [Member]    
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years  
2007 Plan [Member]    
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ntic_TwoThousandSevenPlanMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) 45,067us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ntic_TwoThousandSevenPlanMember
56,373us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ntic_TwoThousandSevenPlanMember
ESPP [Member]    
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ntic_ESPPMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 90.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate
/ us-gaap_PlanNameAxis
= ntic_ESPPMember