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Fair Value of Assets and Liabilities - Investments in Other Investment Company Funds (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Fair Value of Assets and Liabilities
Fair value of investment in Other investments companies	$ 1,680,000		$ 1,680,000		$ 1,660,000
Unrealized gains or losses	34,000	$ 140,000	105,000	$ 238,000
Fair value of investments	4,250,000		4,250,000		$ 4,170,000
Unrealized gains from change in fair value of investments	$ 162,000	$ 194,000	$ 426,000	$ 433,000

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