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Fair Value of Assets and Liabilities - Investments in Other investment company funds (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Fair Value of Assets and Liabilities
Fair value of investment in Other investments companies	$ 1,850,000		$ 1,850,000		$ 1,930,000
Unrealized gains or losses	78,000	$ 31,000	98,000	$ 145,000
Other income			3,730,000
Other income net of tax					$ 3,750,000
Unrealized gains from change in fair value of investments	$ 92,000	$ 83,000	$ 240,000	$ (140,000)

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