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Note 10 - Net Income Per Common Share (Tables) | 12 Months Ended
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Aug. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Numerators: |  | August 31, 2012 |  |  | August 31, 2011 |
Net income attributable to NTIC |  | $ | 3,448,196 |  |  | $ | 3,900,120 |
Denominator: |  |  |  |  |  |  |  |
Basic – weighted shares outstanding |  |  | 4,391,424 |  |  |  | 4,325,863 |
Weighted shares assumed upon exercise of stock options |  |  | 60,170 |  |  |  | 78,237 |
Diluted – weighted shares outstanding |  |  | 4,451,594 |  |  |  | 4,404,100 |
Basic earnings per share: |  | $ | 0.79 |  |  | $ | 0.90 |
Diluted earnings per share: |  | $ | 0.78 |  |  | $ | 0.89 |

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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