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Investments - Available For Sale Securities (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Apr. 30, 2021
--- | --- | ---
Available-For-Sale Securities. |  |
Amortized Cost | $ 18,938 | $ 36,953
Gross Unrealized Gains | 3 | 9
Gross Unrealized Losses | (1) | (3)
Total | 18,940 | 36,959
Municipal securities |  |
Available-For-Sale Securities. |  |
Amortized Cost | 13,249 | 23,227
Gross Unrealized Gains | 3 | 8
Gross Unrealized Losses | (1) | (2)
Total | 13,251 | 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 | 5,689 | 5,718
Gross Unrealized Losses |  | (1)
Total | $ 5,689 | $ 5,717

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