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Inventories (Tables)
3 Months Ended
Aug. 31, 2013
Inventory Disclosure [Abstract]  
Schedule of Inventories

Total inventories consist of the following:

 

     August 31,
2013
     May 31,
2013
 
     (Dollars in thousands)  

Raw materials

   $ 5,616       $ 5,104   

Work in process

     2,818         2,863   

Finished goods

     1,417         765   
  

 

 

    

 

 

 
   $ 9,851       $ 8,732