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Investments - Available For Sale Securities (Details) - USD ($) $ in Thousands	Jan. 30, 2021	Apr. 30, 2020
Available-For-Sale Securities.
Amortized Cost	$ 53,479	$ 58,032
Gross Unrealized Gains	18	70
Gross Unrealized Losses	(6)	(7)
Total	53,491	58,095
Municipal securities
Available-For-Sale Securities.
Amortized Cost	26,691	6,807
Gross Unrealized Gains	12	29
Gross Unrealized Losses	(5)
Total	26,698	6,836
U.S. government securities
Available-For-Sale Securities.
Amortized Cost	17,017	42,730
Gross Unrealized Gains	5	41
Gross Unrealized Losses		(4)
Total	17,022	42,767
Corporate bonds
Available-For-Sale Securities.
Amortized Cost	9,771	8,495
Gross Unrealized Gains	1
Gross Unrealized Losses	(1)	(3)
Total	$ 9,771	$ 8,492

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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