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Note 9 - Net Income Per Common Share (Tables)
 6 Months Ended
Feb. 28, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended   Six Months Ended
Numerators:   February 28,
2018		   February 28,
2017		   February 28,
2018		   February 28,
2017
Net income attributable to NTIC   $
1,332,847
     $
386,966
     $
2,416,473
     $
684,605
  
                                 
Denominators:                                
Basic – weighted shares outstanding    
4,537,408
      
4,525,091
      
4,537,368
      
4,527,555
  
Weighted shares assumed upon exercise of stock options    
135,930
      
36,933
      
103,674
      
31,930
  
Diluted – weighted shares outstanding    
4,673,338
      
4,562,024
      
4,641,042
      
4,559,485
  
Basic income per share:   $
0.29
     $
0.09
     $
0.53
     $
0.15
  
Diluted income per share:   $
0.29
     $
0.09
     $
0.52
     $
0.15