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Inventories (Tables)
6 Months Ended
Oct. 31, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consisted of the following (in thousands):
 
October 31, 2019
 
April 30, 2019
Finished products
$
3,068

 
$
4,139

Work in process
1,878

 
2,179

Raw materials
9,832

 
10,888

 
$
14,778

 
$
17,206