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Note 11 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Number of Stock-based Compensation Plans 2  
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year $ 293,748  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year 159,600  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two $ 79,800  
Estimated Forfeiture Rate for Stock Options 10.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 7.69 $ 8.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 7 years 54 days 6 years 354 days
Net of Estimated Forfeitures [Member]    
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year $ 533,148  
Employee Stock Option [Member]    
Stock or Unit Option Plan Expense $ 97,916 $ 121,854
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 56,677 53,447
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%