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Investments in Securities and Fair Value Investments in Securities (Schedule of Fair Value Assets Measured on Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | $ 63,847 | $ 53,989
Equity securities, at fair value (cost: December 31, 2023: $22,981; December 31, 2022: $25,278) | 37,212 | 51,691
Money market funds and U.S. Treasury bills | 110,224 | 103,649
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 2,220 | 4,322
Equity securities, at fair value (cost: December 31, 2023: $22,981; December 31, 2022: $25,278) | 37,212 | 51,691
Money market funds and U.S. Treasury bills | 110,224 | 103,649
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 61,627 | 49,667
Equity securities, at fair value (cost: December 31, 2023: $22,981; December 31, 2022: $25,278) | 0 | 0
Money market funds and U.S. Treasury bills | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 0 | 0
Equity securities, at fair value (cost: December 31, 2023: $22,981; December 31, 2022: $25,278) | 0 | 0
Money market funds and U.S. Treasury bills | 0 | 0
General obligations of U.S. states, territories and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 36,666 | 42,878
General obligations of U.S. states, territories and political subdivisions | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 2,220 | 4,322
General obligations of U.S. states, territories and political subdivisions | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 34,446 | 38,556
General obligations of U.S. states, territories and political subdivisions | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 0 | 0
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 27,181 | 11,111
Corporate debt securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 0 | 0
Corporate debt securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 27,181 | 11,111
Corporate debt securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | $ 0 | $ 0

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