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Note 10 - Net Income Per Common Share (Tables)
12 Months Ended
Aug. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Numerator:
 
August 31, 2014
   
August 31, 2013
 
Net income attributable to NTIC
  $ 4,106,372     $ 3,366,894  
                 
Denominator:
               
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
    4,579,498       4,475,895  
                 
Basic earnings per share:
  $ 0.92     $ 0.76  
Diluted earnings per share:
  $ 0.90     $ 0.75