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Note 8 - Stockholders' Equity (Tables) | 12 Months Ended
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Aug. 31, 2012
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Shares (#) |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
Outstanding at August 31, 2010 |  |  | 232,472 |  |  | $ | 8.42 |  |  |  |
Options granted |  |  | 30,000 |  |  |  | 9.76 |  |  |  |
Options exercised |  |  | (66,633 | ) |  |  | 6.97 |  |  |  |
Options terminated |  |  | (6,000 | ) |  |  | 8.83 |  |  |  |
Outstanding at August 31, 2011 |  |  | 189,839 |  |  | $ | 9.07 |  |  |  |
Options granted |  |  | 26,000 |  |  |  | 16.45 |  |  |  |
Options exercised |  |  | 3,966 |  |  |  | 8.71 |  |  |  |
Options terminated |  |  | (8,000 | ) |  |  | 9.23 |  |  |  |
Outstanding at August 31, 2012 |  |  | 203,873 |  |  | $ | 10.01 |  |  | $ | 266,332 |
Exercisable at August 31, 2012 |  |  | 166,753 |  |  | $ | 10.42 |  |  | $ | 190,095 |
Stock Option Exercises [Member] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
Options Exercised |  | Exercise Price |
1,966 |  | $7.65 |
2,000 |  | $9.75 |
Options Exercised |  | Exercise Price |
40,000 |  | $ 5.38 |
3,300 |  | 7.65 |
666 |  | 7.75 |
8,000 |  | 8.01 |
4,000 |  | 8.57 |
1,334 |  | 9.75 |
4,000 |  | 9.76 |
5,333 |  | 12.84 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration