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Note 10 - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 31, 2016
May 31, 2015
May 31, 2016
May 31, 2015
Net income attributable to NTIC $ 917,373 $ 905,435 $ 575,233 $ 1,785,056
Basic – weighted shares outstanding (in shares) 4,538,970 4,525,109 4,538,005 4,519,279
Weighted shares assumed upon exercise of stock options (in shares) 24,831 69,883 49,059 116,282
Diluted – weighted shares outstanding (in shares) 4,563,801 4,594,992 4,587,064 4,635,561
Basic income per share: (in dollars per share) $ 0.20 $ 0.20 $ 0.13 $ 0.40
Diluted income per share: (in dollars per share) $ 0.20 $ 0.20 $ 0.13 $ 0.39