Nature Of Business And Significant Accounting Policies (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Nature Of Business And Significant Accounting Policies [Abstract]
Net income (loss)	$ (124)	$ 187
Basic EPS, Shares	3,395,521	3,395,521
Effect of dilutive stock options, shares	0	2,514
Diluted EPS, Shares	3,395,521	3,398,035
Net income (loss) per share, Basic	$ (0.04)	$ 0.06
Effect of dilutive stock options, per share amount	0.00	0.00
Net income (loss) per share, Diluted	$ (0.04)	$ 0.06
Options excluded from the computation of diluted weighted-average shares outstanding|shares	332,500	329,986