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Note 9 - Net Income Per Common Share (Tables) | 3 Months Ended
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Nov. 30, 2012
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |
Numerator: |  | November 30, 2012 |  |  | November 30, 2011 |
Net income attributable to NTIC |  | $ | 389,622 |  |  | $ | 958,757 |
Denominator: |  |  |  |  |  |  |  |
Basic – weighted shares outstanding |  |  | 4,406,205 |  |  |  | 4,355,666 |
Weighted shares assumed upon exercise of stock options |  |  | 34,231 |  |  |  | 78,058 |
Diluted – weighted shares outstanding |  |  | 4,440,436 |  |  |  | 4,433,724 |
Basic earnings per share: |  | $ | 0.09 |  |  | $ | 0.22 |
Diluted earnings per share: |  | $ | 0.09 |  |  | $ | 0.22 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
Name: | us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration