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