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Inventories (Tables)
3 Months Ended
Jul. 31, 2016
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories consisted of the following (in thousands):

 

     July 31, 2016      April 30, 2016  

Finished products

   $ 4,177       $ 3,707   

Work in process

     2,221         1,889   

Raw materials

     10,387         10,030   
  

 

 

    

 

 

 
   $ 16,785       $ 15,626