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Inventories (Tables)
12 Months Ended
May 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories from Continuing Operations

Total inventories from continuing operations consist of the following:

 

     May 31,  
     2016      2015  
     (Dollars in thousands)  

Raw materials

   $ 7,198       $ 5,828   

Work in process

     3,447         3,137   

Finished goods

     736         154   
  

 

 

    

 

 

 
   $ 11,381       $ 9,119