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Investments - Available For Sale Securities (Details) - Available-for-sale securities - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Available-For-Sale Securities.
Amortized Cost	$ 36,953	$ 58,032
Gross Unrealized Gains	9	70
Gross Unrealized Losses	(3)	(7)
Total	36,959	58,095
Municipal securities
Available-For-Sale Securities.
Amortized Cost	23,227	6,807
Gross Unrealized Gains	8	29
Gross Unrealized Losses	(2)
Total	23,233	6,836
U.S. government securities
Available-For-Sale Securities.
Amortized Cost	8,008	42,730
Gross Unrealized Gains	1	41
Gross Unrealized Losses		(4)
Total	8,009	42,767
Corporate bonds
Available-For-Sale Securities.
Amortized Cost	5,718	8,495
Gross Unrealized Losses	(1)	(3)
Total	$ 5,717	$ 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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