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Note 6 - Stock-Based Compensation (Details) (USD $)
3 Months Ended
Aug. 25, 2013
Aug. 26, 2012
Note 6 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation $ 278,000 $ 348,000
Share-based Compensation Expense Per Share (in Dollars per share) $ 0.01 $ 0.01
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 3,100,000  
Restricted Stock Units (RSUs) [Member]
   
Note 6 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation 170,000 157,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 109 days  
Employee Stock Option [Member]
   
Note 6 - Stock-Based Compensation (Details) [Line Items]    
Share-based Compensation $ 108,000 $ 191,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 255 days