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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, 2020 | Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income | $ 4,393 | $ 4,752
Fixed maturity securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income | 2,688 | 2,540
Equity securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income | 1,569 | 1,586
Invested cash and other short-term investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income | 133 | 624
Miscellaneous interest |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income | $ 3 | $ 2

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