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Inventories (Tables)
9 Months Ended
Feb. 28, 2013
Inventories [Abstract]  
Schedule of inventories

Total inventories consist of the following:

 

                 
    February 28,
2013
    May 31,
2012
 
    (Dollars in thousands)  

Raw materials

  $ 5,566     $ 4,743  

Work in process

    3,041       2,543  

Finished goods

    1,733       1,073  
   

 

 

   

 

 

 
    $ 10,340     $ 8,359