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Note 12 - Stock-Based Compensation (Details Textual) - USD ($)
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
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    
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    
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    
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%    
Employee Stock Option [Member]      
Stock or Unit Option Plan Expense $ 495,683 $ 454,015 $ 306,451
Net of Estimated Forfeitures [Member]      
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year 259,585    
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year $ 179,785    
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 $ 11.58 $ 8.57 $ 5.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 219 days 5 years 335 days 4 years 189 days