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Note 10 - Stock-Based Compensation (Details) (USD $)
3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Note 10 - 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 96,294
Stock or Unit Option Plan Expense $ 127,927 $ 43,393
Allocated Share-based Compensation Expense, Net of Tax, Per Share (in Dollars per share) $ 0.03 $ 0.01
Allocated Share-based Compensation Expense, Estimate, Remainder of Fiscal Year 326,089  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year 186,598  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two 99,985  
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) $ 8.54 $ 5.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 98 days 4 years 299 days
Net of Estimated Forfeitures [Member]
   
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 612,673  
Employee Stock Option [Member]
   
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Stock or Unit Option Plan Expense $ 127,927 $ 43,393
2007 Plan [Member]
   
Note 10 - 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) 56,373 118,294
2007 Plan [Member] | Minimum [Member]
   
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
2007 Plan [Member] | Maximum [Member]
   
Note 10 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years  
ESPP [Member]
   
Note 10 - 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 10 - 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 10 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   10 years