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Note 10 - Stock-based Compensation (Details Textual)
9 Months Ended
May 31, 2018
USD ($)
$ / shares
shares
May 31, 2017
USD ($)
$ / shares
shares
Number of Stock-based Compensation Plans 2  
Stock or Unit Option Plan Expense $ 309,473 $ 293,748
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 322,402  
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year 103,267  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year 153,901  
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 $ 7.75 $ 7.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 189 days 6 years 266 days
The 2007 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 47,252 56,677
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 | shares 100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 90.00%