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Fair Value of Assets and Liabilities - Investments in Other Investment Company Funds (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Fair Value of Assets and Liabilities |  |  |  |  |
Fair value of investment in Other investments companies | $ 1,690,000 |  | $ 1,690,000 |  | $ 1,660,000
Unrealized gains or losses | 12,000 | $ 78,000 | 71,000 | $ 98,000 |
Fair value of investments | 4,090,000.00 |  | 4,090,000.00 |  | $ 4,170,000
Unrealized gains from change in fair value of investments | $ 116,000 | $ 92,000 | $ 264,000 | $ 240,000 |

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