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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, 2021 | Dec. 31, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | $ 3,773 | $ 4,393
Fixed maturity securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | 2,337 | 2,688
Equity securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | 1,413 | 1,569
Invested cash and other short-term investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | 21 | 133
Miscellaneous interest |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | $ 2 | $ 3

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