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Note 11 - Net Income Per Common Share (Tables)
12 Months Ended
Aug. 31, 2015
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Numerator:   August 31, 2015   August 31, 2014   August 31, 2013
Net income attributable to NTIC   $ 1,789,571     $ 4,106,372     $ 3,366,894  
                         
Denominator:                        
Basic-weighted shares outstanding     4,521,788       4,454,836       4,421,636  
Weighted shares assumed upon exercise of stock options     127,272       124,662       54,259  
Diluted – weighted shares outstanding     4,649,060       4,579,498       4,475,895  
                         
Basic earnings per share:   $ 0.40     $ 0.92     $ 0.76  
Diluted earnings per share:   $ 0.38     $ 0.90     $ 0.75