Summary Of Significant Accounting Policies (Schedule Of Earnings Per Share Basic And Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]
Weighted average shares outstanding (basic)	4,375	4,382
Impact of common stock equivalents	21	22
Weighted average shares outstanding (diluted)	4,396	4,404
Anti-dilutive options excluded from calculation	10
Net income	$ 16,115	$ 6,125
Basic earnings per share	$ 3.68	$ 1.40
Diluted earnings per share	$ 3.67	$ 1.39