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Note 11 - Stock-based Compensation (Details Textual)
9 Months Ended 12 Months Ended
Mar. 01, 2016
shares
Sep. 01, 2015
shares
Sep. 01, 2014
shares
May 31, 2016
shares
Aug. 31, 2016
USD ($)
$ / shares
Aug. 31, 2015
USD ($)
$ / shares
The 2007 Plan [Member] | Minimum [Member] | One Year after Date of Grant [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years    
The 2007 Plan [Member] | Maximum [Member] | One Year after Date of Grant [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
The 2007 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares       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 | shares       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         $ 427,437 $ 495,683
Number of Stock-based Compensation Plans       2    
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares 3,144 2,438 3,206      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options         239,400  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year         159,600  
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 | $ / shares         $ 8.48 $ 11.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term         6 years 167 days 5 years 219 days