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Note 11 - Net Income Per Common Share (Tables) | 12 Months Ended
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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 |

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