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Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020
Inventory, Net [Abstract] |  |
Finished goods | $ 31,704 | $ 36,014
Work-in-process | 2,060 | 1,398
Paper and other materials | 331 | 331
Total inventories before estimated sales returns and LIFO reserve | 34,095 | 37,743
Inventory value of estimated sales returns | 10,886 | 8,686
LIFO reserve | (2,443) | (2,815)
Inventories, net | 42,538 | 43,614
Adjustment for lower of cost or net realizable value | $ 14,000 | $ 16,100

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