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Note 10 - Stockholders' Equity (Details Textual) - $ / shares
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)         0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         174,840 419,874
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 2,966 2,636 5,225 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  
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)         51,218  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)         $ 6.60  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)         42,071 0
ESPP [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)           69,220