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Note 8 - Net Income Per Common Share (Tables) | 9 Months Ended
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May 31, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
Numerators: |  | May 31, 2014 |  |  | May 31, 2013 |  |  | May 31, 2014 |  |  | May 31, 2013 |
Net income attributable to NTIC |  | $ | 980,217 |  |  | $ | 927,112 |  |  | $ | 2,863,847 |  |  | $ | 1,751,144 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic – weighted shares outstanding |  |  | 4,461,880 |  |  |  | 4,421,379 |  |  |  | 4,452,798 |  |  |  | 4,415,452 |
Weighted shares assumed upon exercise of stock options |  |  | 128,464 |  |  |  | 47,482 |  |  |  | 130,376 |  |  |  | 49,322 |
Diluted – weighted shares outstanding |  |  | 4,590,344 |  |  |  | 4,468,861 |  |  |  | 4,583,174 |  |  |  | 4,464,774 |
Basic earnings per share: |  | $ | 0.22 |  |  | $ | 0.21 |  |  | $ | 0.64 |  |  | $ | 0.40 |
Diluted earnings per share: |  | $ | 0.21 |  |  | $ | 0.21 |  |  | $ | 0.63 |  |  | $ | 0.39 |

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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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