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Note 10 - Net Income (Loss) Per Common Share (Tables)
 6 Months Ended
Feb. 28, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended   Six Months Ended
Numerators:   February 28,
2017		   February
29, 2016		   February 28,
2017		   February
29, 2016
Net income (loss) attributable to NTIC   $
386,966
     $
(107,789
 )   $
684,605
     $
(342,140
 )
                                 
Denominators:                                
Basic – weighted shares outstanding    
4,525,091
      
4,537,429
      
4,527,555
      
4,536,995
  
Weighted shares assumed upon exercise of stock options    
36,933
      
—
      
31,930
      
—
  
Diluted – weighted shares outstanding    
4,562,024
      
4,537,429
      
4,559,485
      
4,536,995
  
Basic income (loss) per share:   $
0.09
     $
(0.02
 )   $
0.15
     $
(0.08
 )
Diluted income (loss) per share:   $
0.09
     $
(0.02
 )   $
0.15
     $
(0.08
 )