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Inventories (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021
Inventories [Abstract]
Finished goods	$ 28,645	$ 31,704
Work-in-process	2,767	2,060
Paper and other materials	376	331
Total inventories before estimated sales returns and LIFO reserve	31,788	34,095
Inventory value of estimated sales returns	11,047	10,886
LIFO reserve	(2,443)	(2,443)
Inventories, net	$ 40,392	$ 42,538

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Amount of inventory reserves for estimated sales returns.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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