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Fair Value of Assets and Liabilities - Investments in Other investment company funds (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Fair value of investment in Other investments companies | $ 2,160,000 | $ 1,930,000 | $ 2,160,000
Unrealized gains or losses |  | (58,000) | (204,000)
Fair value of investments | 3,650,000 | 3,750,000 | 3,650,000
Unrealized gains from change in fair value of investments |  | $ 103,000 | $ 2,860,000
ASU 2022-03 | Change in accounting policy for investments |  |  |
Other income | 2,700,000 |  |
Other income net of tax | $ 2,200,000 |  |

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