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Fair Value of Assets and Liabilities - Other investments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Fair Value of Assets and Liabilities |  |  |
Fair value of investment in Other investments companies | $ 2,240,000 |  | $ 2,160,000
Unrealized gains or losses | (115,000) | $ 24,000 |
Other income | 3,430,000 |  |
Other income net of tax |  |  | $ 3,650,000
Unrealized gains from change in fair value of investments | $ 11,000 |  |

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