Common Stock Options (Schedule Of Stock Options Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Shares		0
Exercised, Number of Shares		0	0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Number of Shares		100,000	50,000
Granted, Number of Shares		0	50,000
Exercised, Number of Shares		0	0
Canceled/forfeited/expired, Number of Shares		0	0
Ending balance, Number of Shares		100,000	100,000	50,000
Beginning balance, Weighted-Average Exercise Price		$ 3.81	$ 4.21
Granted, Weighted-Average Exercise Price			3.41
Ending balance, Weighted-Average Exercise Price		$ 3.81	$ 3.81	$ 4.21
Balance, Weighted-Average Remaining Contractual Term		7 years 8 months 12 days	8 years 8 months 12 days	7 years 7 months 6 days
Weighted average remaining contractual term			10 years
Vested and exercisable, Aggregate Intrinsic Value	[1]	$ 32
Number of shares vested		70,000
Director Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Number of Shares		207,500	207,500
Granted, Number of Shares		0	0
Exercised, Number of Shares		0	0
Canceled/forfeited/expired, Number of Shares		0	0
Ending balance, Number of Shares		207,500	207,500	207,500
Beginning balance, Weighted-Average Exercise Price		$ 4.62	$ 4.62
Ending balance, Weighted-Average Exercise Price		$ 4.62	$ 4.62	$ 4.62
Balance, Weighted-Average Remaining Contractual Term		5 years 4 months 24 days	6 years 4 months 24 days	7 years 4 months 24 days
Vested and exercisable, Aggregate Intrinsic Value	[1]	$ 0
Number of shares vested		202,500

[1] The aggregate intrinsic value is calculated as approximately the difference between the weighted average exercise price of the underlying awards and the Company’s estimated current fair market value at December 31, 2017.