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Note 7 - Stock-Based Compensation (Detail) (USD $)
3 Months Ended
Aug. 26, 2012
Aug. 28, 2012
Aug. 28, 2011
Share-based Compensation $ 348,000 $ 441,000 $ 441,000
Share-Based Compensation Expense Per Share (in Dollars per share) $ 0.01 $ 0.02  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 1,400,000    
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation 157,000 202,000  
Stock Options [Member]
     
Share-based Compensation $ 191,000 $ 239,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 146 days