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Inventories (Tables)
12 Months Ended
Apr. 30, 2017
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories consisted of the following at April 30:

 

$ in thousands

   2017      2016  

Finished goods

   $     3,179      $     3,707  

Work-in-process

     1,950        1,889  

Materials and components

     9,806        10,030  
  

 

 

    

 

 

 

Total inventories

   $ 14,935      $ 15,626