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Inventories (Details) - USD ($)
$ in Thousands
Oct. 31, 2022
Apr. 30, 2022
Inventory Disclosure [Abstract]    
Finished goods $ 30,245 $ 31,270
Work-in-process 1,182 1,729
Paper and other materials 182 275
Total inventories before estimated sales returns and LIFO reserve 31,609 33,274
Inventory value of estimated sales returns 7,347 7,820
LIFO reserve (4,509) (4,509)
Inventories, net $ 34,447 $ 36,585