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Note 10 - Net Income Per Common Share (Details) - Reconciliation of the Earnings Per Share Computations - USD ($)
 3 Months Ended 9 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Reconciliation of the Earnings Per Share Computations [Abstract]        
Net income attributable to NTIC (in Dollars) $ 905,435 $ 980,217 $ 1,785,056 $ 2,863,847
Denominator:        
Basic – weighted shares outstanding 4,525,109 4,461,880 4,519,279 4,452,798
Weighted shares assumed upon exercise of stock options 69,883 128,464 116,282 130,376
Diluted – weighted shares outstanding 4,594,992 4,590,344 4,635,561 4,583,174
Basic earnings per share: (in Dollars per share) $ 0.20 $ 0.22 $ 0.40 $ 0.64
Diluted earnings per share: (in Dollars per share) $ 0.20 $ 0.21 $ 0.39 $ 0.63