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Note 10 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 300,770 141,768
Share-based Payment Arrangement, Expense $ 318,818 $ 357,980
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount 1,018,956  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year 1,018,956  
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 $ 4.30 $ 9.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 284 days 6 years 237 days
The 2019 Plan [member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 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 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 3 years  
ESPP [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 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 87,447