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Investments - Available For Sale Securities (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Apr. 30, 2021
Available-For-Sale Securities.
Amortized Cost	$ 6,309	$ 36,953
Gross Unrealized Gains	2	9
Gross Unrealized Losses		(3)
Total	6,311	36,959
Municipal securities
Available-For-Sale Securities.
Amortized Cost	6,309	23,227
Gross Unrealized Gains	2	8
Gross Unrealized Losses		(2)
Total	$ 6,311	23,233
U.S. government securities
Available-For-Sale Securities.
Amortized Cost		8,008
Gross Unrealized Gains		1
Total		8,009
Corporate bonds
Available-For-Sale Securities.
Amortized Cost		5,718
Gross Unrealized Losses		(1)
Total		$ 5,717

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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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