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Note 9 - Income Taxes (Detail) (USD $)
3 Months Ended
Aug. 26, 2012
Aug. 28, 2011
May 27, 2012
Income Tax Expense (Benefit) $ 2,565,000 $ 1,110,000  
Effective Income Tax Rate, Continuing Operations 37.00% 38.00%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00%    
Unrecognized Tax Benefits     766,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate     593,000
Unrecognized Tax Benefits Future Period $ 8,000