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Note 9 - Stockholders' Equity (Details) - Exercised Stock Options (USD $)
 6 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Exercise 1 [Member]    
Note 9 - Stockholders' Equity (Details) - Exercised Stock Options [Line Items]    
Options Exercised 18,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntic_Exercise1Member		 1,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntic_Exercise1Member
Excercise Price $ 7.65us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntic_Exercise1Member		 $ 7.65us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntic_Exercise1Member
Exercise 2 [Member]    
Note 9 - Stockholders' Equity (Details) - Exercised Stock Options [Line Items]    
Options Exercised 2,333us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntic_Exercise2Member		  
Excercise Price $ 10.20us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntic_Exercise2Member