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Note 8 - Stockholders' Equity (Details Textual) |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2020 $ / shares | Oct. 22, 2019 $ / shares | Jul. 24, 2019 $ / shares | Jun. 28, 2019 | Jun. 03, 2019 | Apr. 25, 2019 $ / shares | Jan. 23, 2019 $ / shares | Oct. 24, 2018 $ / shares | May 31, 2020 $ / shares | Aug. 31, 2020 USD ($) $ / shares shares | Aug. 31, 2019 $ / shares shares | Jan. 15, 2015 USD ($)
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  | 2 | 2 |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares | $ 0.065 | $ 0.065 | $ 0.06 |  |  | $ 0.06 | $ 0.06 | $ 0.06 | $ 0 | $ 0.13 | $ 0.24 |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ |  |  |  |  |  |  |  |  |  | $ 2,640,548 |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Including Cashless Exercises (in shares) |  |  |  |  |  |  |  |  |  | 11,974 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 5.13 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  |  |  |  |  |  |  |  | 6,823 | 0 |

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