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Note 10 - Net Income Per Common Share (Tables) | 12 Months Ended
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Aug. 31, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Numerator: |  | August 31, 2013 |  |  | August 31, 2012 |
Net income attributable to NTIC |  | $ | 3,366,894 |  |  | $ | 3,448,196 |
Denominator: |  |  |  |  |  |  |  |
Basic – weighted shares outstanding |  |  | 4,421,636 |  |  |  | 4,391,424 |
Weighted shares assumed upon exercise of stock options |  |  | 54,259 |  |  |  | 60,170 |
Diluted – weighted shares outstanding |  |  | 4,475,895 |  |  |  | 4,451,594 |
Basic earnings per share: |  | $ | 0.76 |  |  | $ | 0.79 |
Diluted earnings per share: |  | $ | 0.75 |  |  | $ | 0.78 |

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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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