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Inventories (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Apr. 30, 2021
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Inventories [Abstract] |  |
Finished goods | $ 28,645 | $ 31,704
Work-in-process | 2,767 | 2,060
Paper and other materials | 376 | 331
Total inventories before estimated sales returns and LIFO reserve | 31,788 | 34,095
Inventory value of estimated sales returns | 11,047 | 10,886
LIFO reserve | (2,443) | (2,443)
Inventories, net | $ 40,392 | $ 42,538

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