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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, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities, available-for-sale, at fair value $ 112,972 $ 63,847
Equity securities, at fair value (cost: December 31, 2024: $25,980; December 31, 2023: $22,981) 39,893 37,212
Money market funds and U.S. Treasury bills 59,101 110,224
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities, available-for-sale, at fair value 302 2,220
Equity securities, at fair value (cost: December 31, 2024: $25,980; December 31, 2023: $22,981) 39,893 37,212
Money market funds and U.S. Treasury bills 59,101 110,224
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities, available-for-sale, at fair value 112,670 61,627
Equity securities, at fair value (cost: December 31, 2024: $25,980; December 31, 2023: $22,981) 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, 2024: $25,980; December 31, 2023: $22,981) 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 24,912 36,666
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 302 2,220
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 24,610 34,446
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 88,060 27,181
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 88,060 27,181
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