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Note 8 - Stockholders' Equity (Details Textual) |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2020 shares | Jan. 22, 2020 $ / shares | Oct. 22, 2019 $ / shares | Sep. 01, 2019 shares | Jun. 28, 2019 | Jun. 03, 2019 | Apr. 25, 2019 $ / shares | Mar. 01, 2019 shares | Jan. 23, 2019 $ / shares | Oct. 24, 2018 $ / shares | Sep. 01, 2018 shares | May 31, 2020 $ / shares | May 31, 2019 $ / shares | May 31, 2020 $ / shares shares | May 31, 2019 $ / shares shares
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 | $ 0.06 | $ 0.13 | $ 0.18
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) |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,770 | 141,768
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,823 | 0
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | 2,754 |  |  | 3,597 |  |  |  | 2,462 |  |  | 1,748 |  |  |  |
The 2019 Plan [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,770 |
The 2019 Plan [member] | Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,770 | 141,768
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.87 |
The 2007 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.23

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