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Note 6 - Stock-Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended
Feb. 23, 2014
Feb. 24, 2013
Feb. 23, 2014
Feb. 24, 2013
Note 6 - Stock-Based Compensation (Details) [Line Items]        
Share-based Compensation $ 353,000 $ 464,000 $ 992,000 $ 1,135,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 2,400,000   2,400,000  
Restricted Stock Units (RSUs) [Member]
       
Note 6 - Stock-Based Compensation (Details) [Line Items]        
Share-based Compensation 222,000 230,000 576,000 528,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years  
Employee Stock Option [Member]
       
Note 6 - Stock-Based Compensation (Details) [Line Items]        
Share-based Compensation $ 131,000 $ 234,000 $ 416,000 $ 607,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 36 days