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Note 10 - Net Income Per Common Share (Tables)
 3 Months Ended
Nov. 30, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended
Numerator:   November 30, 2016   November 30, 2015
Net income (loss) attributable to NTIC   $
297,639
     $
(234,351
 )
                 
Denominator:                
Basic – weighted shares outstanding    
4,531,950
      
4,538,371
  
Weighted shares assumed upon exercise of stock options    
26,928
      
—
  
Diluted – weighted shares outstanding    
4,558,878
      
4,538,371
  
Basic earnings (loss) per share:   $
0.07
     $
(0.05
 )
Diluted earnings (loss) per share:   $
0.07
     $
(0.05
 )