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Note 10 - Net Income Per Common Share (Details) - Reconciliation of the Earnings Per Share Computations (USD $)
 3 Months Ended 12 Months Ended
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2013
Aug. 31, 2012
Reconciliation of the Earnings Per Share Computations [Abstract]                    
Net income attributable to NTIC (in Dollars) $ 1,615,750 $ 927,112 $ 434,410 $ 389,622         $ 3,366,894 $ 3,448,196
Basic – weighted shares outstanding                 4,421,636 4,391,424
Weighted shares assumed upon exercise of stock options                 54,259 60,170
Diluted – weighted shares outstanding 4,501,017 4,468,861 4,485,076 4,440,436 4,436,444 4,461,044 4,466,435 4,433,724 4,475,895 4,451,594
Basic earnings per share: (in Dollars per share) $ 0.37 $ 0.21 $ 0.10 $ 0.09 $ 0.10 $ 0.33 $ 0.14 $ 0.22 $ 0.76 $ 0.79
Diluted earnings per share: (in Dollars per share) $ 0.36 $ 0.21 $ 0.10 $ 0.09 $ 0.10 $ 0.33 $ 0.14 $ 0.22 $ 0.75 $ 0.78