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Inventories (Tables)
6 Months Ended
Oct. 31, 2015
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories consisted of the following (in thousands):

 

     October 31, 2015      April 30, 2015  

Finished products

   $ 3,082       $ 2,936   

Work in process

     1,885         1,422   

Raw materials

     8,773         8,387   
  

 

 

    

 

 

 
   $ 13,740       $ 12,745