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Note 10 - Stock-based Compensation (Details Textual)
9 Months Ended
May 31, 2019
USD ($)
$ / shares
shares
May 31, 2018
USD ($)
$ / shares
shares
Number of Stock-based Compensation Plans 2  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 141,768 94,504
Stock or Unit Option Plan Expense | $ $ 1,073,940 $ 309,473
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 423,245  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year | $ 357,985  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two | $ $ 65,260  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 9.01 $ 3.88
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 54 days 6 years 189 days
The 2019 Plan [member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares 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 | shares 0  
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 3 years  
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 4 years  
ESPP [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares 200,000  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 90.00%