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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 3,624	$ 5,203	$ 3,685	$ 14,153
Weighted average shares outstanding (basic)	9,792	9,860	9,774	9,904
Effect of dilutive stock options	22	63	29	67
Weighted average shares outstanding (diluted)	9,814	9,923	9,803	9,971
Basic earnings per share	$ 0.37	$ 0.53	$ 0.38	$ 1.43
Diluted earnings per share	$ 0.37	$ 0.52	$ 0.38	$ 1.42