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Inventories (Details) - USD ($) $ in Thousands | Jan. 31, 2022 | Apr. 30, 2021
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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

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