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Note 9 - Net Income Per Common Share (Tables) | 3 Months Ended
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Nov. 30, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |
Numerator: |  | November 30, 2014 |  |  | November 30, 2013 |
Net income attributable to NTIC |  | $ | 1,008,265 |  |  | $ | 858,586 |
Denominator: |  |  |  |  |  |  |  |
Basic – weighted shares outstanding |  |  | 4,518,973 |  |  |  | 4,434,770 |
Weighted shares assumed upon exercise of stock options |  |  | 140,648 |  |  |  | 117,899 |
Diluted – weighted shares outstanding |  |  | 4,659,621 |  |  |  | 4,552,669 |
Basic earnings per share: |  | $ | 0.22 |  |  | $ | 0.19 |
Diluted earnings per share: |  | $ | 0.22 |  |  | $ | 0.19 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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