Note 10 - Stockholders' Equity (Details Textual) - $ / shares
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9 Months Ended |
Mar. 01, 2022 |
Sep. 01, 2021 |
Mar. 01, 2021 |
Sep. 01, 2020 |
May 31, 2022 |
May 31, 2021 |
| Stock Repurchased and Retired During Period, Shares (in shares) |
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0
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |
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174,840
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419,874
|
| Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |
2,966
|
2,636
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5,225
|
4,646
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| The 2019 Plan [member] |
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|
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|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |
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|
895,484
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| Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |
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704,516
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| The 2019 Plan [member] | Employees and Directors [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |
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174,840
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419,874
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| Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |
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|
$ 16.97
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$ 8.24
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Including Cashless Exercises (in shares) |
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51,218
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| Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) |
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$ 6.60
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| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |
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42,071
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0
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| ESPP [Member] |
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| Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |
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69,220
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