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Note 9 - Net Income Per Common Share (Details) - Reconciliation of the Earnings Per Share Computations (USD $)
 3 Months Ended 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Reconciliation of the Earnings Per Share Computations [Abstract]        
Net income attributable to NTIC (in Dollars) $ 927,112 $ 1,454,037 $ 1,751,144 $ 3,018,987
Basic – weighted shares outstanding 4,421,379 4,399,290 4,415,452 4,379,175
Weighted shares assumed upon exercise of stock options 47,482 61,754 49,322 65,297
Diluted – weighted shares outstanding 4,468,861 4,461,044 4,464,774 4,448,472
Basic earnings per share: (in Dollars per share) $ 0.21 $ 0.33 $ 0.40 $ 0.69
Diluted earnings per share: (in Dollars per share) $ 0.21 $ 0.33 $ 0.39 $ 0.68