Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
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

Amount of inventory reserves for estimated sales returns.

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- Definition

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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- Definition

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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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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