Summary Of Significant Accounting Policies (Schedule Of Earnings Per Share Basic And Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Abstract]
Weighted average shares outstanding (basic)									4,382	4,337	4,297
Impact of common stock equivalents									22	22	5
Weighted average shares outstanding (diluted)									4,404	4,359	4,302
Anti-dilutive options excluded from calculation											9
Net income	$ 3,804	$ 4,000	$ (5,181)	$ 3,502	$ (7,263)	$ 3,076	$ 3,342	$ 3,020	$ 6,125	$ 2,176	$ 8,087
Basic earnings per share	$ 0.86	$ 0.91	$ (1.18)	$ 0.80	$ (1.67)	$ 0.71	$ 0.77	$ 0.70	$ 1.40	$ 0.50	$ 1.88
Diluted earnings per share	$ 0.86	$ 0.91	$ (1.18)	$ 0.80	$ (1.67)	$ 0.70	$ 0.77	$ 0.70	$ 1.39	$ 0.50	$ 1.88