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Note 12 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Jan. 15, 2021
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   1,544,727 1,426,651 1,127,968
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   $ 931,532 $ 664,174  
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   1,009,719    
Allocated Share-based Compensation Expense, Estimate Next Twelve Months   671,526    
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two   $ 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)   $ 16.97 $ 8.24  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)   5 years 9 months 3 days 6 years 2 months 12 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, Outstanding, Number, Ending Balance (in shares)   867,721    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   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)   649,243