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Fair Value of Assets and Liabilities - Investments in small business investment company funds (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value of Assets and Liabilities      
Fair value of investment in small business investment companies $ 2,500,000   $ 1,470,000
Unrealized gains or losses $ 24,000 $ 45,000