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Note 10 - Stock-based Compensation (Details Textual) - USD ($)
9 Months Ended
May 31, 2020
May 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 300,770 141,768
Share-based Payment Arrangement, Expense $ 998,122 $ 1,073,940
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   $ 360,486
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year 339,652  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two $ 20,834  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 4.30 $ 9.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) 6 years 98 days 6 years 54 days
The 2019 Plan [member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 800,000  
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) 300,770  
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) 84,693