Investments in Securities and Fair Value Investments in Securities (Schedule of Earnings on Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	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