Quarterly Information (Schedule Of Quarterly Financial Information) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Quarterly Information [Abstract]
Revenue	$ 6,925	[1]	$ 7,050		$ 6,886		$ 7,081		$ 7,118	[1]	$ 6,829		$ 5,811		$ 6,178		$ 27,942		$ 25,936
Operating loss	(13,633)	[1]	(4,019)		(3,447)		(3,154)		(3,618)	[1]	(3,443)		(2,577)		(1,951)		(24,253)		(11,589)		(8,671)
Net income (loss)	(7,068)	[1]	(922)		(228)		(1,234)		(1,864)	[1]	(1,689)		(240)		872		(9,452)		(2,921)		2,852
Basic earnings (loss) per common share	$ (1.24)	[1]	$ (0.16)		$ (0.04)		$ (0.22)		$ (0.34)	[1]	$ (0.31)		$ (0.05)		$ 0.16		$ (1.66)		$ (0.54)		$ 0.53
Basic loss per puttable common share			$ (0.16)		$ (0.04)		$ (0.22)												$ (0.54)
Basic earnings (loss) per puttable common share			$ (0.16)		$ (0.04)		$ (0.22)												$ (0.54)
Diluted earnings (loss) per common share	$ (1.24)	[1],[2]	$ (0.16)	[2]	$ (0.04)	[2]	$ (0.22)	[2]	$ (0.34)	[1],[2]	$ (0.31)	[2]	$ (0.05)	[2]	$ 0.16	[2]	$ (1.66)	[2]	$ (0.54)	[2]	$ 0.52
Diluted loss per puttable common share			$ (0.16)	[2]	$ (0.04)	[2]	$ (0.22)	[2]											$ (0.54)
Diluted earnings (loss) per puttable common share			$ (0.16)	[2]	$ (0.04)	[2]	$ (0.22)	[2]											$ (0.54)
Basic	5,702,738	[1]	5,744,020		5,730,702		5,716,020										5,711,815		5,413,144		5,363,543
Basic (puttable common)			25,148		272,479		272,479												186
Basic									5,435,849	[1]	5,424,927		5,406,894		5,389,842				5,413,330
Diluted	5,702,738	[1]	5,744,020		5,730,702		5,716,020										5,711,815		5,413,144		5,407,994
Diluted (puttable common)			25,148		272,479		272,479												186
Diluted									5,435,849	[1]	5,424,927		5,406,894		5,416,020				5,413,330
Impairment loss assets																	$ (8,883)				$ (2,283)

[1] Includes appximately $8.9 million of impairment on assets related to the Telephone segment.

[2] As a result of the net loss, there is no difference between basic and diluted earnings (loss) per share.