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Inventories (Details) - USD ($)
$ in Thousands
Jan. 31, 2022
Apr. 30, 2021
Inventories [Abstract]    
Finished goods $ 29,613 $ 31,704
Work-in-process 2,053 2,060
Paper and other materials 260 331
Total inventories before estimated sales returns and LIFO reserve 31,926 34,095
Inventory value of estimated sales returns 10,243 10,886
LIFO reserve (2,443) (2,443)
Inventories, net $ 39,726 $ 42,538