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Note 10 - Stockholders' Equity (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013 | Jan. 15, 2015
2007 Plan [Member] |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 20.10 | $ 14.83 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 45,067 | 56,373 |  |
Stock Repurchased and Retired During Period, Shares | 1,587 | 0 | 0 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 20.10 | $ 14.83 | $ 10.25 |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 3,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 2,975,654 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 15.34 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 297,696 | $ 890,955 | $ 45,533 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 45,067 | 56,373 | 118,294 |

X
- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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