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Note 9 - Net Income Per Common Share (Tables)
 9 Months Ended
May 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended   Nine Months Ended
Numerators:   May 31, 2018   May 31, 2017   May 31, 2018   May 31, 2017
Net income attributable to NTIC   $
2,142,752
     $
1,352,416
     $
4,559,225
     $
2,037,021
  
Denominators:                                
Basic – weighted shares outstanding    
4,539,353
      
4,526,771
      
4,538,838
      
4,528,523
  
Weighted shares assumed upon exercise of stock options    
167,679
      
64,756
      
125,009
      
42,872
  
Diluted – weighted shares outstanding    
4,707,032
      
4,591,527
      
4,663,847
      
4,571,395
  
Basic income per share:   $
0.47
     $
0.30
     $
1.00
     $
0.45
  
Diluted income per share:   $
0.46
     $
0.30
     $
0.98
     $
0.45