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Investments In Securities and Fair Value (Schedule Of Gross Unrealized Gains And Losses And Amortized Cost For Securities) (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Impairment amount for cost-method investments	$ 0		$ 0
Total, amortized cost	77,714		112,037
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037)	82,306		117,713
Other-than-temporary impairment loss, debt securities, available-for-sale, recognized in earnings	0	$ 482
Government obligations
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax			57
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax			0
Total, amortized cost			24,026
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037)			24,083
General obligations of U.S. states, territories and political subdivisions
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	991		1,262
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	0		0
Total, amortized cost	17,214		17,391
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037)	$ 18,205		$ 18,653
Special revenue issuer obligations of U.S. states, territories and political subdivisions
Debt and Equity Securities, FV-NI [Line Items]
Number of Special Revenue Bonds	50		50
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	$ 2,598		$ 3,270
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	2		3
Total, amortized cost	42,356		44,939
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037)	44,952		48,206
Corporate debt securities
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	1,017		1,114
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	12		24
Total, amortized cost	18,144		25,681
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037)	19,149		26,771
Total fixed maturities
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	4,606		5,703
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	14		27
Total, amortized cost	77,714		112,037
Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2021: $77,714; December 31, 2020: $112,037)	$ 82,306		$ 117,713

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