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Note 11 - Stock-based Compensation (Details Textual)
12 Months Ended
Mar. 01, 2017
shares
Sep. 01, 2016
shares
Mar. 01, 2016
shares
Sep. 01, 2015
shares
Aug. 31, 2017
USD ($)
$ / shares
shares
Aug. 31, 2016
USD ($)
$ / shares
Number of Stock-based Compensation Plans         2  
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares 1,098 3,029 3,144 2,438    
Stock or Unit Option Plan Expense         $ 391,664 $ 427,437
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  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares         $ 7.69 $ 8.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term         6 years 281 days 6 years 167 days
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  
The 2007 Plan [Member] | One Year after Date of Grant [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years  
The 2007 Plan [Member] | One Year after Date of Grant [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         4 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%