Common Stock Options And Stock Purchase Plan (Schedule Of Stock Options Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Exercised, Number of Shares		0	0
Employee Stock Option [Member]
Beginning balance, Number of Shares		50,000	50,000
Granted, Number of Shares		50,000	0
Exercised, Number of Shares		0	0
Canceled/forfeited/expired, Number of Shares		0	0
Ending balance, Number of Shares		100,000	50,000	50,000
Beginning balance, Weighted-Average Exercise Price		$ 4.21	$ 4.21
Granted, Weighted-Average Exercise Price		3.41
Ending balance, Weighted-Average Exercise Price		$ 3.81	$ 4.21	$ 4.21
Balance, Weighted-Average Remaining Contractual Term		8 years 7 months 13 days	7 years 7 months 6 days	8 years 7 months 6 days
Sharebased Compensation Arrangement by Sharebased Payment Award Option Granted Weighted Average Remaining Contractual Term		10 years
Vested and exercisable, Aggregate Intrinsic Value	[1]	$ 3
Number of shares vested		60,000
Director Stock Option [Member]
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		6 years 4 months 24 days	7 years 4 months 24 days	8 years 7 months 24 days
Vested and exercisable, Aggregate Intrinsic Value	[1]	$ 0
Number of shares vested		162,500

[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, 2016.