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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies - Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
May. 31, 2015
May. 25, 2014
Fair Value, Inputs, Level 1 [Member]    
Investment in private company    
Total    
Liabilities:    
Interest rate swap    
Total    
Fair Value, Inputs, Level 2 [Member]    
Investment in private company    
Total    
Liabilities:    
Interest rate swap   $ 44
Total   44
Fair Value, Inputs, Level 3 [Member]    
Investment in private company $ 61,500 39,600
Total $ 61,500 $ 39,600
Liabilities:    
Interest rate swap    
Total