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Note 10 - Net Income Per Common Share (Tables) | 6 Months Ended
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Feb. 28, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
Numerators: |  | February 28, 2015 |  |  | February 28, 2014 |  |  | February 28, 2015 |  |  | February 28, 2014 |
Net (loss) income attributable to NTIC |  | $ | (128,644 | ) |  | $ | 1,025,044 |  |  | $ | 876,621 |  |  | $ | 1,883,630 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic – weighted shares outstanding |  |  | 4,522,514 |  |  |  | 4,434,837 |  |  |  | 4,516,311 |  |  |  | 4,434,770 |
Weighted shares assumed upon exercise of stock options |  |  | - |  |  |  | 144,766 |  |  |  | 139,481 |  |  |  | 131,333 |
Diluted – weighted shares outstanding |  |  | 4,522,514 |  |  |  | 4,579,603 |  |  |  | 4,655,792 |  |  |  | 4,566,103 |
Basic earnings (loss) per share: |  | $ | (0.03 | ) |  | $ | 0.23 |  |  | $ | 0.20 |  |  | $ | 0.42 |
Diluted earnings (loss) per share: |  | $ | (0.03 | ) |  | $ | 0.22 |  |  | $ | 0.19 |  |  | $ | 0.41 |

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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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