Description Of Business And Significant Accounting Policies (Reconciliations Of The Numerators And Denominators On Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Common Share [Abstract]
Net loss	$ (1,754)	$ (813)	$ (554)	$ (527)	$ (167)	$ (182)	$ 9	$ (96)	$ (3,648)	$ (436)
Weighted average shares - basic									889,670	887,612
Dilution effect of share-based compensation, treasury method
Weighted average shares - dilutive									889,670	887,612
Basic	$ (1.92)	$ (0.96)	$ (0.60)	$ (0.60)	$ (0.12)	$ (0.24)	$ 0.01	$ (0.12)	$ (4.10)	$ (0.49)
Dilutive									$ (4.10)	$ (0.49)