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Note 3 - Property and Equipment - Components of Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
May. 31, 2015
May. 25, 2014
Land and Building [Member] | Minimum [Member]    
Years of Useful Life 15 years  
Land and Building [Member] | Maximum [Member]    
Years of Useful Life 40 years  
Land and Building [Member]    
Gross property and equipment $ 57,426 $ 56,378
Leasehold Improvements [Member] | Minimum [Member]    
Years of Useful Life 3 years  
Leasehold Improvements [Member] | Maximum [Member]    
Years of Useful Life 20 years  
Leasehold Improvements [Member]    
Gross property and equipment $ 1,360 1,079
Computer Capitalized Software Machinery Equipment and Auto [Member] | Minimum [Member]    
Years of Useful Life 3 years  
Computer Capitalized Software Machinery Equipment and Auto [Member] | Maximum [Member]    
Years of Useful Life 20 years  
Computer Capitalized Software Machinery Equipment and Auto [Member]    
Gross property and equipment $ 68,260 53,715
Furniture and Fixtures [Member] | Minimum [Member]    
Years of Useful Life 3 years  
Furniture and Fixtures [Member] | Maximum [Member]    
Years of Useful Life 7 years  
Furniture and Fixtures [Member]    
Gross property and equipment $ 804 824
Construction in Progress [Member]    
Gross property and equipment 6,837 6,975
Gross property and equipment 134,687 118,971
Less accumulated depreciation and amortization (50,222) (44,831)
Property and equipment, net $ 84,465 $ 74,140