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Investments, at Fair Value - Debt Securities Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Mar. 31, 2025
Amortized Cost Basis    
Due in one year or less $ 1,687 $ 1,687
No fixed maturity 0 998
Amortized Cost Basis 1,687 2,685
Fair Value    
Due in one year or less 1,777 1,687
No fixed maturity 0 0
Fair Value $ 1,777 $ 1,687