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Fair Value of Assets and Liabilities - Investments in Other Investment Company Funds (Details) - USD ($)
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Fair Value of Assets and Liabilities      
Fair value of investment in Other investments companies $ 1,700,000   $ 1,660,000
Unrealized gains or losses 59,000 $ 20,000  
Fair value of investments 3,980,000   $ 4,170,000
Unrealized gains from change in fair value of investments $ 148,000 $ 148,000