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Note 10 - Stock-based Compensation (Details Textual)
6 Months Ended
Feb. 28, 2019
USD ($)
$ / shares
shares
Feb. 28, 2018
USD ($)
$ / shares
shares
Nov. 16, 2018
shares
Number of Stock-based Compensation Plans 2    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 70,884 47,252  
Stock or Unit Option Plan Expense | $ $ 715,960 $ 206,534  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ 781,195    
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year | $ 715,961    
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two | $ $ 65,234    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 18.03 $ 7.75  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 146 days 6 years 273 days  
The 2019 Plan [member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 400,000   400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0    
The 2007 Plan [Member]      
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 70,884 47,252  
The 2007 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 2007 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 100,000    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 90.00%