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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 15 Months Ended
Aug. 31, 2014
May 31, 2014
Feb. 28, 2014
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Aug. 31, 2014
Aug. 31, 2013
Nov. 30, 2014
Nov. 30, 2013
Reconciliation of the Earnings Per Share Computations [Abstract]                    
Net income attributable to NTIC (in Dollars) $ 1,242,527 $ 980,217 $ 1,025,044 $ 1,615,750 $ 927,112 $ 434,410 $ 4,106,372 $ 3,366,894 $ 858,586 $ 389,622
Basic – weighted shares outstanding             4,454,836 4,421,636    
Weighted shares assumed upon exercise of stock options             124,662 54,259    
Diluted – weighted shares outstanding 4,592,208 4,590,344 4,579,603 4,501,017 4,468,861 4,485,076 4,579,498 4,475,895 4,552,669 4,440,436
Basic earnings per share: (in Dollars per share) $ 0.28 $ 0.22 $ 0.23 $ 0.37 $ 0.21 $ 0.10 $ 0.92 $ 0.76 $ 0.19 $ 0.09
Diluted earnings per share: (in Dollars per share) $ 0.27 $ 0.21 $ 0.22 $ 0.36 $ 0.21 $ 0.10 $ 0.90 $ 0.75 $ 0.19 $ 0.09