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

Inventories consisted of the following (in thousands):

 

     January 31, 2017      April 30, 2016  

Finished products

   $ 3,568      $ 3,707  

Work in process

     2,101        1,889  

Raw materials

     10,062        10,030  
  

 

 

    

 

 

 
   $ 15,731      $ 15,626