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Inventories (Tables)
6 Months Ended
Nov. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventories

Total inventories consist of the following:

 

     November 30, 2015      May 31, 2015  
     (Unaudited)         
     (Dollars in thousands)  

Raw materials

   $ 6,611       $ 5,828   

Work in process

     2,970         3,137   

Finished goods

     1,178         154   
  

 

 

    

 

 

 
   $ 10,759       $ 9,119