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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)
12 Months Ended
May. 31, 2015
May. 25, 2014
May. 26, 2013
Capital Leased Assets, Gross $ 0    
Operating Leases, Rent Expense 5,000,000 $ 4,400,000 $ 4,800,000
Accrued Bonuses 1,000,000 $ 656,000  
Purchase Commitment, Remaining Minimum Amount Committed 15,100,000    
Payment on Purchase Commitments $ 16,800,000