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
	Mar. 31, 2018	Mar. 31, 2017
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 4,083	$ 3,419
Weighted average shares outstanding (basic)	8,913	8,851
Effect of dilutive stock options	92	99
Weighted average shares outstanding (diluted)	9,005	8,950
Basic earnings per share	$ 0.46	$ 0.39
Diluted earnings per share	$ 0.45	$ 0.38
Anti-dilutive stock options excluded from the computation of earnings per share	16	0