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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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