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Inventories (Details) - USD ($) $ in Thousands | Jul. 31, 2024 | Apr. 30, 2024
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Inventory Disclosure [Abstract] |  |
Finished goods | $ 24,056 | $ 24,295
Work-in-process | 1,441 | 1,445
Paper and other materials | 307 | 181
Total inventories before estimated sales returns and LIFO reserve | 25,804 | 25,921
Inventory value of estimated sales returns | 7,578 | 7,833
LIFO reserve | (7,536) | (7,535)
Inventories, net | $ 25,846 | $ 26,219

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