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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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Amount of other income net of tax.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of revenue and income classified as other.

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Amount of unrealized gain (loss) on investment.

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