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Inventories (Tables)
9 Months Ended
Jan. 31, 2021
Inventory Disclosure [Abstract]  
Summary of Inventories Inventories consisted of the following (in thousands):
January 31, 2021April 30, 2020
Finished products$2,712 $2,455 
Work in process1,826 1,921 
Raw materials11,077 10,954 
$15,615 $15,330