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Note 9 - Net Income Per Common Share (Tables)
 9 Months Ended
May 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended   Nine Months Ended
Numerator:   May 31, 2020   May 31, 2019   May 31, 2020   May 31, 2019
Net income attributable to NTIC   $
(965,221
 )   $
1,482,149
     $
427,163
     $
4,380,776
  
                                 
Denominator:                                
Basic – weighted shares outstanding    
9,099,990
      
9,084,354
      
9,096,981
      
9,085,584
  
Weighted shares assumed upon exercise of stock options    
-
      
308,090
      
215,933
      
355,274
  
Diluted – weighted shares outstanding    
9,099,990
      
9,392,444
      
9,312,914
      
9,440,858
  
Basic net income per share:   $
(0.11
 )   $
0.16
     $
0.05
     $
0.48
  
Diluted net income per share:   $
(0.11
 )   $
0.16
     $
0.05
     $
0.46