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Note 10 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Mar. 01, 2021
Jan. 15, 2021
Sep. 01, 2020
Mar. 01, 2020
Sep. 01, 2019
Aug. 31, 2021
Aug. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)           419,874 300,770
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 5,225   4,646 2,754 3,597    
Stock or Unit Option Plan Expense           $ 664,174 $ 1,337,774
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two           $ 666,667  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)           $ 8.24 $ 10.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)           6 years 2 months 12 days 5 years 1 month 2 days
The 2019 Plan [member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)   800,000          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)           1,600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)           10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)           419,874 300,770
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)           879,356  
The 2019 Plan [member] | One Year after Date of Grant [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)           1 year  
The 2019 Plan [member] | One Year after Date of Grant [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)           3 years  
ESPP [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)           200,000  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent           90.00%  
Common Stock, Capital Shares Reserved for Future Issuance (in shares)           74,822