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Note 12 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jan. 15, 2021
May 31, 2022
May 31, 2021
May 31, 2022
May 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       174,840 419,874
Share-Based Payment Arrangement, Expense   $ 232,883 $ 160,834 $ 698,649 $ 503,338
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   $ 1,242,602   1,242,602  
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year       232,883  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two       671,526  
Allocated Share Based Compensation Expense, Estimate, Fiscal Year Three       $ 338,193  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)       $ 7.29 $ 3.12
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)       6 years 7 days 6 years 4 months 24 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   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)       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] | 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  
The 2007 Plan [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   654,789   654,789