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Note 10 - Stock-based Compensation (Details Textual)
3 Months Ended
Nov. 30, 2018
USD ($)
$ / shares
shares
Nov. 30, 2017
USD ($)
$ / shares
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 | $ $ 357,980 $ 103,267
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ 1,139,175  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year | $ 1,073,941  
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 237 days 6 years 346 days
The 2007 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 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%  
The 2019 Plan [member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 400,000