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Fair Value of Assets and Liabilities - Investments in Other investment company funds (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Fair Value of Assets and Liabilities |  |  |
Fair value of investment in Other investments companies | $ 1,840,000 |  | $ 1,930,000
Unrealized gains or losses | 20,000 | $ 123,000 |
Other income | 3,650,000 |  |
Other income net of tax |  |  | $ 3,750,000
Unrealized gains from change in fair value of investments | $ 148,000 | $ 11,000 |

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