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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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