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Note 11 - Stock-based Compensation (Details) - USD ($)
9 Months Ended
May. 31, 2015
May. 31, 2014
Note 11 - Stock-based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years 10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) 45,067 56,373
Allocated Share-based Compensation Expense, Estimate, Remainder of Fiscal Year $ 117,262  
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 (in Dollars per share) $ 11.58 $ 8.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 204 days 5 years 160 days
2007 Plan [Member]    
Note 11 - Stock-based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) 45,067 56,373
ESPP [Member]    
Note 11 - Stock-based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 90.00%  
Net of Estimated Forfeitures [Member]    
Note 11 - Stock-based Compensation (Details) [Line Items]    
Allocated Share-based Compensation Expense, Estimate, Remainder of Fiscal Year $ 376,847  
Employee Stock Option [Member]    
Note 11 - Stock-based Compensation (Details) [Line Items]    
Stock or Unit Option Plan Expense $ 378,421 $ 345,319
Minimum [Member] | One Year after Date of Grant [Member] | 2007 Plan [Member]    
Note 11 - Stock-based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Maximum [Member] | One Year after Date of Grant [Member] | 2007 Plan [Member]    
Note 11 - Stock-based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years