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Note 8 - Net Income Per Common Share (Details) - Reconciliation of the Earnings Per Share Computations (USD $)
 3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Reconciliation of the Earnings Per Share Computations [Abstract]        
Net income attributable to NTIC (in Dollars) $ 980,217 $ 927,112 $ 2,863,847 $ 1,751,144
Basic – weighted shares outstanding 4,461,880 4,421,379 4,452,798 4,415,452
Weighted shares assumed upon exercise of stock options 128,464 47,482 130,376 49,322
Diluted – weighted shares outstanding 4,590,344 4,468,861 4,583,174 4,464,774
Basic earnings per share: (in Dollars per share) $ 0.22 $ 0.21 $ 0.64 $ 0.40
Diluted earnings per share: (in Dollars per share) $ 0.21 $ 0.21 $ 0.63 $ 0.39