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Note 9 - Stock-Based Compensation (Details) (USD $)
9 Months Ended
May 31, 2014
May 31, 2013
Note 9 - Stock-Based Compensation (Details) [Line Items]    
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) 56,373 118,294
Allocated Share-based Compensation Expense, Estimate, Remainder of Fiscal Year $ 108,696  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year 186,598  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two 99,986  
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) $ 8.57 $ 5.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 160 days 4 years 175 days
Employee Stock Option [Member]
   
Note 9 - Stock-Based Compensation (Details) [Line Items]    
Stock or Unit Option Plan Expense 345,319 213,374
Net of Estimated Forfeitures [Member]
   
Note 9 - Stock-Based Compensation (Details) [Line Items]    
Allocated Share-based Compensation Expense, Estimate, Remainder of Fiscal Year $ 395,280  
One Year after Date of Grant [Member] | Minimum [Member] | 2007 Plan [Member]
   
Note 9 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
One Year after Date of Grant [Member] | Maximum [Member] | 2007 Plan [Member]
   
Note 9 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years  
2007 Plan [Member]
   
Note 9 - 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 5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)   118,294
ESPP [Member]
   
Note 9 - 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%  
Minimum [Member]
   
Note 9 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   5 years
Maximum [Member]
   
Note 9 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   10 years