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Investments in Securities and Fair Value Investments in Securities (Schedule of Earnings on Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | $ 4,704 | $ 3,773
Fixed maturity securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | 1,902 | 2,337
Equity securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | 1,425 | 1,413
Invested cash and other short-term investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | 1,375 | 21
Miscellaneous interest |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | $ 2 | $ 2

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