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Note 6 - Stock-Based Compensation (Detail) (USD $)
3 Months Ended 9 Months Ended
Feb. 24, 2013
Feb. 26, 2012
Feb. 24, 2013
Feb. 26, 2012
Share-based Compensation $ 464,000 $ 429,000 $ 1,135,000 $ 1,314,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 1,000,000   1,000,000  
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation 230,000 192,000 528,000 587,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 109 days  
Stock Options [Member]
       
Share-based Compensation $ 234,000 $ 237,000 $ 607,000 $ 727,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 219 days