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Note 9 - Net Income Per Common Share (Tables)
3 Months Ended
Nov. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended
  November 30, 2019   November 30, 2018
Numerator:
               
Net income attributable to NTIC   $
1,212,550
    $
1,497,059
 
                 
Denominator:                
Basic – weighted shares outstanding    
9,095,607
     
9,084,350
 
Weighted shares assumed upon exercise of stock options    
312,035
     
394,226
 
Diluted – weighted shares outstanding    
9,407,642
     
9,478,576
 
Basic net income per share:   $
0.13
    $
0.16
 
Diluted net income per share:   $
0.13
    $
0.16