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Inventories (Details) - USD ($) $ in Thousands | Jan. 31, 2024 | Apr. 30, 2023
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Inventory Disclosure [Abstract] |  |
Finished goods | $ 25,997 | $ 29,339
Work-in-process | 1,209 | 1,031
Paper and other materials | 261 | 248
Total inventories before estimated sales returns and LIFO reserve | 27,467 | 30,618
Inventory value of estimated sales returns | (7,718) | (6,923)
LIFO reserve | (6,808) | (6,808)
Inventories, net | $ 28,377 | $ 30,733

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