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Note 9 - Net Income Per Common Share (Detail) - Reconciliation of the Earnings Per Share Computations: (USD $)
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Net income attributable to NTIC (in Dollars) $ 389,622 $ 958,757
Basic – weighted shares outstanding 4,406,205 4,355,666
Weighted shares assumed upon exercise of stock options 34,231 78,058
Diluted – weighted shares outstanding 4,440,436 4,433,724
Basic earnings per share: (in Dollars per share) $ 0.09 $ 0.22
Diluted earnings per share: (in Dollars per share) $ 0.09 $ 0.22