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Fair Value of Assets and Liabilities - Investments in Other Investment Company Funds (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Fair Value of Assets and Liabilities |  |  |
Fair value of investment in Other investments companies | $ 1,700,000 |  | $ 1,660,000
Unrealized gains or losses | 59,000 | $ 20,000 |
Fair value of investments | 3,980,000 |  | $ 4,170,000
Unrealized gains from change in fair value of investments | $ 148,000 | $ 148,000 |

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