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Note 10 - Stockholders' Equity (Details Textual) - $ / shares |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 21, 2022 | Oct. 20, 2021 | Sep. 01, 2021 | Sep. 01, 2020 | Feb. 28, 2022 | Feb. 28, 2021 | Feb. 28, 2022 | Feb. 28, 2021
Stock Repurchased and Retired During Period, Shares (in shares) |  |  |  |  |  |  | 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  | 174,840 | 419,874
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.07 | $ 0.07 |  |  | $ 0.07 | $ 0.065 | $ 0.14 | $ 0.065
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  | 2,636 | 4,646 |  |  |  |
The 2019 Plan [member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  | 895,484 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 704,516 |  | 704,516 |
The 2019 Plan [member] | Employees and Directors [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  | 174,840 | 419,874
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  |  |  |  | $ 16.97 | $ 8.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Including Cashless Exercises (in shares) |  |  |  |  |  |  | 43,218 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  |  |  |  | $ 6.45 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  |  |  |  |  | 34,071 | 0
ESPP [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 72,186 |  | 72,186 |

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