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Inventories (Tables)
6 Months Ended
Nov. 30, 2012
Inventories [Abstract]  
Schedule of inventories

Total inventories consist of the following:

 

                 
    November 30, 2012     May 31, 2012  
    (Dollars in thousands)  

Raw materials

  $ 5,329     $ 4,743  

Work in process

    2,526       2,543  

Finished goods

    2,856       1,073  
   

 

 

   

 

 

 
    $ 10,711     $ 8,359