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Inventories (Tables)
3 Months Ended
Jul. 31, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consisted of the following (in thousands):
 
July 31, 2019
 
April 30, 2019
Finished products
$
3,657

 
$
4,139

Work in process
2,185

 
2,179

Raw materials
10,509

 
10,888

 
$
16,351

 
$
17,206