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Note 11 - Stock-Based Compensation (Details Textual) - USD ($)
6 Months Ended
Sep. 02, 2015
Sep. 02, 2014
Feb. 29, 2016
Feb. 28, 2015
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     800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     53,447 45,067
ESPP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     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     $ 223,715 $ 261,159
Net of Estimated Forfeitures [Member]        
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year     $ 443,123  
Number of Stock-based Compensation Plans     2  
Stock Issued During Period, Shares, Employee Stock Purchase Plans 2,439 1,948    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     53,447 45,067
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year     $ 203,723  
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     $ 8.48 $ 11.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     6 years 350 days