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Note 9 - Net Income Per Common Share (Tables)
3 Months Ended
Nov. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended
Numerator:   November 30, 2018   November 30, 2017
Net income attributable to NTIC   $
1,497,059
    $
1,083,626
 
                 
Denominator:                
Basic – weighted shares outstanding    
4,542,175
     
4,537,368
 
Weighted shares assumed upon exercise of stock options    
197,113
     
71,420
 
Diluted – weighted shares outstanding    
4,739,288
     
4,608,788
 
Basic net income per share:   $
0.33
    $
0.24
 
Diluted net income per share:   $
0.32
    $
0.24