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Inventories
3 Months Ended
Aug. 31, 2011
Inventories [Abstract]  
Inventories
NOTE 3 Inventories
Total inventories consist of the following:
                 
    August 31, 2011     May 31, 2011  
    (Dollars in thousands)  
 
               
Raw materials
  $ 5,361     $ 5,016  
 
               
Work in process
    2,844       3,300  
 
               
Finished goods
    2,069       404  
 
           
 
  $ 10,274     $ 8,720