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Inventories (Tables)
12 Months Ended
Apr. 30, 2016
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories consisted of the following at April 30:

 

$ in thousands

   2016      2015  

Finished goods

   $     3,707        $     2,936    

Work-in-process

     1,889          1,422    

Materials and components

     10,030          8,387    
  

 

 

    

 

 

 

Total inventories

   $ 15,626        $ 12,745