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

Inventories consisted of the following (in thousands):

 

     October 31, 2017      April 30, 2017  

Finished products

   $ 3,260      $ 3,179  

Work in process

     2,036        1,950  

Raw materials

     11,143        9,806  
  

 

 

    

 

 

 
   $ 16,439      $ 14,935