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Investments - Available For Sale Securities (Details) - USD ($) $ in Thousands | Apr. 30, 2023 | Apr. 30, 2022
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Available-For-Sale Securities |  |
Amortized Cost |  | $ 24,751
Gross Unrealized Losses |  | (35)
Total | $ 0 | 24,716
Municipal securities |  |
Available-For-Sale Securities |  |
Amortized Cost |  | 19,756
Gross Unrealized Losses |  | (31)
Total |  | 19,725
U.S. government securities |  |
Available-For-Sale Securities |  |
Amortized Cost |  | 4,995
Gross Unrealized Losses |  | (4)
Total |  | $ 4,991

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