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Note 3 - Property and Equipment (Tables)
 12 Months Ended
May. 31, 2015
Notes Tables  
Property, Plant and Equipment [Table Text Block]
 
 
Years of
 
 
 
 
 
 
 
 
 
 
Useful Life
 
May 31, 2015
 
 
May 25, 2014
 
Land and building
     15- 40     $ 57,426     $ 56,378  
Leasehold improvements
     3- 20       1,360       1,079  
Computer, capitalized software, machinery, equipment and auto
     3- 20       68,260       53,715  
Furniture and fixtures
     3- 7       804       824  
Construction in process
               6,837       6,975  
Gross property and equipment
               134,687       118,971  
Less accumulated depreciation and amortization
               (50,222 )     (44,831 )
Net property and equipment
             $ 84,465     $ 74,140