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Fair Value of Assets and Liabilities - Investments in Other investment company funds (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value of Assets and Liabilities
Fair value of investment in Other investments companies	$ 1,660,000	$ 1,930,000
Unrealized gains or losses	(273,000)	344,000
Fair value of investments	4,170,000	3,750,000
Unrealized gains from change in fair value of investments	$ 687,000	$ 333,000

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