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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, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | $ 53,989 | $ 79,791
Equity securities, at fair value (cost: December 31, 2022: $25,278; December 31, 2021: $29,478) | 51,691 | 76,853
Money market funds and US treasury bills | 103,649 | 45,930
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 4,322 | 0
Equity securities, at fair value (cost: December 31, 2022: $25,278; December 31, 2021: $29,478) | 51,691 | 76,853
Money market funds and US treasury bills | 103,649 | 45,930
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, available-for-sale, at fair value | 49,667 | 79,791
Equity securities, at fair value (cost: December 31, 2022: $25,278; December 31, 2021: $29,478) | 0 | 0
Money market funds and US 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, 2022: $25,278; December 31, 2021: $29,478) | 0 | 0
Money market funds and US 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 | 42,878 | 61,795
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 | 4,322 | 0
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 | 38,556 | 61,795
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 | 11,111 | 17,996
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 | 11,111 | 17,996
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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