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Note 10 - Net Income Per Common Share (Tables)
 9 Months Ended
May 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended   Nine Months Ended
Numerators:   May 31, 2017   May 31, 2016   May 31, 2017   May 31, 2016
Net income attributable to NTIC   $
1,352,416
     $
917,373
     $
2,037,021
     $
575,233
  
Denominators:                                
Basic – weighted shares outstanding    
4,526,771
      
4,538,970
      
4,528,523
      
4,538,005
  
Weighted shares assumed upon exercise of stock options    
64,756
      
24,831
      
42,872
      
49,059
  
Diluted – weighted shares outstanding    
4,591,527
      
4,563,801
      
4,571,395
      
4,587,064
  
Basic income per share:   $
0.30
     $
0.20
     $
0.45
     $
0.13
  
Diluted income per share:   $
0.30
     $
0.20
     $
0.45
     $
0.13