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Investments - Available For Sale Securities (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Apr. 30, 2020
Available-For-Sale Securities.
Amortized Cost	$ 82,775	$ 58,032
Gross Unrealized Gains	12	70
Gross Unrealized Losses	(9)	(7)
Total	82,778	58,095
Municipal securities
Available-For-Sale Securities.
Amortized Cost	18,915	6,807
Gross Unrealized Gains	9	29
Gross Unrealized Losses	(5)
Total	18,919	6,836
U.S. government securities
Available-For-Sale Securities.
Amortized Cost	54,022	42,730
Gross Unrealized Gains	3	41
Gross Unrealized Losses		(4)
Total	54,025	42,767
Corporate bonds
Available-For-Sale Securities.
Amortized Cost	9,838	8,495
Gross Unrealized Losses	(4)	(3)
Total	$ 9,834	$ 8,492

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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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