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Inventories (Details) - USD ($) $ in Thousands | Jul. 31, 2025 | Apr. 30, 2025
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Inventory Disclosure [Abstract] |  |
Finished goods | $ 26,526 | $ 27,581
Work-in-process | 717 | 632
Paper and other materials | 165 | 124
Total inventories before estimated sales returns and LIFO reserve | 27,408 | 28,337
Inventory value of estimated sales returns | 4,047 | 4,042
LIFO reserve | (9,504) | (9,504)
Inventories, net | $ 21,951 | $ 22,875

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