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Inventories (Tables)
9 Months Ended
Jan. 31, 2020
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consisted of the following (in thousands):
 
January 31, 2020
 
April 30, 2019
Finished products
$
3,135

 
$
4,139

Work in process
1,796

 
2,179

Raw materials
10,315

 
10,888

 
$
15,246

 
$
17,206