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Note 10 - Stock-Based Compensation (Detail) (USD $)
3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
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) 96,294 26,000
Allocated Share-based Compensation Expense $ 43,393 $ 72,523
Allocated Share-based Compensation Expense, Net of Tax, Per Share (in Dollars per share) $ 0.01  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Net of Estimated Forfeitures, Stock Options 578,138  
Allocated Share-based Compensation Expense, Estimate, Remainder of Fiscal Year 282,652  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year 181,774  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two $ 96,841  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 5.53 $ 7.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 299 days 2 years 295 days
2007 Plan [Member] | Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
2007 Plan [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 (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]
   
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]
   
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 5 years  
Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years