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Inventories (Tables)
3 Months Ended
Aug. 31, 2012
Inventories [Abstract]  
Schedule of inventories
                 
    August 31,
2012
    May 31,
2012
 
    (Dollars in thousands)  

Raw materials

  $ 5,220     $ 4,743  

Work in process

    2,744       2,543  

Finished goods

    1,786       1,073  
   

 

 

   

 

 

 
    $ 9,750     $ 8,359