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Note 8 - Net Income Per Common Share (Details) - Reconciliation of the Earnings Per Share Computations (USD $)
 3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Reconciliation of the Earnings Per Share Computations [Abstract]        
Net income attributable to NTIC (in Dollars) $ 1,025,044 $ 434,410 $ 1,883,630 $ 824,032
Basic – weighted shares outstanding 4,434,837 4,418,821 4,434,770 4,409,954
Weighted shares assumed upon exercise of stock options 144,766 66,255 131,333 50,243
Diluted – weighted shares outstanding 4,579,603 4,485,076 4,566,103 4,460,197
Basic earnings per share: (in Dollars per share) $ 0.23 $ 0.10 $ 0.42 $ 0.19
Diluted earnings per share: (in Dollars per share) $ 0.22 $ 0.10 $ 0.41 $ 0.18