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Note 8 - Net Income Per Common Share (Tables) | 6 Months Ended
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Feb. 28, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
Numerators: |  | February 28, 2014 |  |  | February 28, 2013 |  |  | February 28, 2014 |  |  | February 28, 2013 |
Net income attributable to NTIC |  | $ | 1,025,044 |  |  | $ | 434,410 |  |  | $ | 1,883,630 |  |  | $ | 824,032 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic – weighted shares outstanding |  |  | 4,434,837 |  |  |  | 4,418,821 |  |  |  | 4,434,770 |  |  |  | 4,409,954 |
Weighted shares assumed upon exercise of stock options |  |  | 144,766 |  |  |  | 66,255 |  |  |  | 131,333 |  |  |  | 50,243 |
Diluted – weighted shares outstanding |  |  | 4,579,603 |  |  |  | 4,485,076 |  |  |  | 4,566,103 |  |  |  | 4,460,197 |
Basic earnings per share: |  | $ | 0.23 |  |  | $ | 0.10 |  |  | $ | 0.42 |  |  | $ | 0.19 |
Diluted earnings per share: |  | $ | 0.22 |  |  | $ | 0.10 |  |  | $ | 0.41 |  |  | $ | 0.18 |

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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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