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Note 6 - Inventories (Tables)
6 Months Ended
Nov. 30, 2014
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
November 30,
2014
   
May 25,
2014
 
Finished goods
  $ 14,304     $ 11,111  
Raw materials
    12,089       10,376  
Work in progress
    4,047       3,248  
Total
  $ 30,440     $ 24,735