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Note 10 - Net Income Per Common Share (Tables)
9 Months Ended
May 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended   Nine Months Ended
Numerators:   May 31, 2016   May 31, 2015   May 31, 2016   May 31, 2015
Net income attributable to NTIC   $ 917,373     $ 905,435     $ 575,233     $ 1,785,056  
                                 
Denominators:                                
Basic – weighted shares outstanding     4,538,970       4,525,109       4,538,005       4,519,279  
Weighted shares assumed upon exercise of stock options     24,831       69,883       49,059       116,282  
Diluted – weighted shares outstanding     4,563,801       4,594,992       4,587,064       4,635,561  
Basic income per share:   $ 0.20     $ 0.20     $ 0.13     $ 0.40  
Diluted income per share:   $ 0.20     $ 0.20     $ 0.13     $ 0.39