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Note 2 - Restatement of Previously Reported Consolidated Financial Statements (Detail) (USD $)
3 Months Ended
Aug. 26, 2012
Aug. 28, 2011
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income $ 4,296,000 $ 52,000
After Tax Effect [Member] | Windsest [Member]
   
Investments, Fair Value Disclosure 1,800,000  
Windsest [Member]
   
Investments, Fair Value Disclosure 2,900,000  
Increase (Decrease) in Deferred Income Taxes 1,100,000  
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income $ 2,900,000