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Inventories (Tables)
3 Months Ended
Jul. 31, 2017
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories consisted of the following (in thousands):

 

     July 31, 2017      April 30, 2017  

Finished products

   $ 4,419      $ 3,179  

Work in process

     1,941        1,950  

Raw materials

     10,641        9,806  
  

 

 

    

 

 

 
   $ 17,001      $ 14,935