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Investments, at Fair Value - Debt Securities Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | ---
Amortized Cost Basis |  |
Due in one year or less | $ 1,687 | $ 66,000
No fixed maturity | 998 | 998
Amortized Cost Basis | 2,685 | 66,998
Fair Value |  |
Due in one year or less | 2,129 | 75,900
No fixed maturity | 998 | 998
Fair Value | $ 3,127 | $ 76,898

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