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Fair Value of Assets and Liabilities - Investments in Other investment company funds (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Fair Value of Assets and Liabilities
Fair value of investment in Other investments companies	$ 1,630,000		$ 1,630,000		$ 1,930,000
Unrealized gains or losses	140,000	$ 72,000	238,000	$ 270,000
Other income			3,920,000
Other income net of tax					$ 3,750,000
Unrealized gains from change in fair value of investments	$ 194,000	$ 137,000	$ 433,000	$ 210,000

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