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Inventories (Tables)
6 Months Ended
Oct. 31, 2020
Inventory Disclosure [Abstract]  
Summary of Inventories Inventories consisted of the following (in thousands):
October 31, 2020April 30, 2020
Finished products$2,890 $2,455 
Work in process1,756 1,921 
Raw materials11,478 10,954 
$16,124 $15,330