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Note 9 - Net Income Per Common Share (Tables)
 12 Months Ended
Aug. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Numerator:   August 31, 2019   August 31, 2018
Net income attributable to NTIC   $
5,209,622
     $
6,701,366
  
                 
Denominator:                
Basic-weighted shares outstanding    
9,085,584
      
9,077,676
  
Weighted shares assumed upon exercise of stock options    
330,390
      
292,728
  
Diluted – weighted shares outstanding    
9,415,974
      
9,370,404
  
                 
Basic earnings per share:   $
0.57
     $
0.74
  
Diluted earnings per share:   $
0.55
     $
0.72