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Note 10 - Net Income Per Common Share (Tables)
12 Months Ended
Aug. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Numerators:
 
August 31, 2012
   
August 31, 2011
 
Net income attributable to NTIC
  $ 3,448,196     $ 3,900,120  
                 
Denominator:
               
Basic – weighted shares outstanding
    4,391,424       4,325,863  
Weighted shares assumed upon exercise of stock options
    60,170       78,237  
Diluted – weighted shares outstanding
    4,451,594       4,404,100  
                 
Basic earnings per share:
  $ 0.79     $ 0.90  
Diluted earnings per share:
  $ 0.78     $ 0.89