Summary Of Significant Accounting Policies (Schedule Of Computation Of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 5,060	$ 3,410	$ 15,197	$ 10,514
Weighted average shares outstanding (basic)	9,398	9,325	9,379	9,308
Effect of dilutive stock options	107	103	96	105
Weighted average shares outstanding (diluted)	9,505	9,428	9,475	9,413
Basic earnings per share	$ 0.53	$ 0.37	$ 1.62	$ 1.13
Diluted earnings per share	$ 0.53	$ 0.36	$ 1.60	$ 1.11
Anti-dilutive stock options excluded from the computation of earnings per share	1	0	2	0