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Note 8 - Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 21, 2021 | Apr. 23, 2021 | Jan. 15, 2021 | Jan. 22, 2020 | Oct. 22, 2019 | Nov. 30, 2020 | Aug. 31, 2020 | May 31, 2020 | Aug. 31, 2021 | Aug. 31, 2020 | Jan. 15, 2015
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.065 | $ 0.065 | $ 0.065 | $ 0.065 | $ 0.065 | $ 0 | $ 0 | $ 0 | $ 0.20 | $ 0.13 |
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) |  |  |  |  |  |  |  |  | 77,645 | 11,975 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  |  |  |  |  |  | $ 8.18 | $ 5.13 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  |  |  |  |  |  |  | 74,950 | 6,823 |

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