Quarterly Information (Schedule Of Quarterly Financial Information) (Details) (USD $)	3 Months Ended															6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Information [Abstract]
Operating revenues	$ 7,385,000		$ 7,530,000	[1]	$ 7,447,000	$ 7,740,000		$ 6,925,000	[2]	$ 7,050,000	[1],[2]	$ 6,886,000	[2]	$ 7,081,000	[2]			$ 30,102,000		$ 27,942,000	[2]	$ 25,936,000
Segment operating loss	(2,261,000)		(2,099,000)	[1]	(2,955,000)	(4,299,000)		(13,633,000)	[2]	(4,019,000)	[1],[2]	(3,447,000)	[2]	(3,154,000)	[2]	(7,254,000)	(9,353,000)	(11,614,000)		(24,253,000)	[2]	(11,589,000)
Net income (loss)	(309,000)		343,000	[1]	(9,000)	(671,000)		(8,505,000)	[2]	(922,000)	[1],[2]	(228,000)	[2]	(1,234,000)	[2]	(680,000)	(337,000)	(646,000)		(10,889,000)	[2]	(2,921,000)
Net income (loss) per share - Basic	$ (0.05)		$ 0.06	[1]		$ (0.12)		$ (1.49)	[2]	$ (0.16)	[1],[2]	$ (0.04)	[2]	$ (0.22)	[2]	$ (0.12)	$ (0.06)	$ (0.11)		$ (1.91)	[2]	$ (0.54)
Basic loss per puttable common share										$ (0.16)	[1],[2]	$ (0.04)	[2]	$ (0.22)	[2]							$ (0.54)
Diluted loss per common share	$ (0.05)	[3]	$ 0.06	[1],[3]		$ (0.12)	[3]	$ (1.49)	[2],[3]	$ (0.16)	[1],[2],[3]	$ (0.04)	[2],[3]	$ (0.22)	[2],[3]	$ (0.12)	$ (0.06)	$ (0.11)	[3]	$ (1.91)	[2],[3]	$ (0.54)
Diluted loss per puttable common share										$ (0.16)	[1],[2],[3]	$ (0.04)	[2],[3]	$ (0.22)	[2],[3]							$ (0.54)
Basic (common)	6,191,000		5,776,000	[1]	5,775,000	5,751,000		5,703,000	[2]	5,744,000	[1],[2]	5,731,000	[2]	5,716,000	[2]			6,111,608		5,711,815		5,413,144
Basic (puttable common)										25,000	[1],[2]	272,000	[2]	272,000	[2]							186
Diluted (common)	6,191,000		5,776,000	[1]	5,775,000	5,751,000		5,703,000	[2]	5,744,000	[1],[2]	5,731,000	[2]	5,716,000	[2]			6,111,608		5,711,815		5,413,144
Diluted (puttable common)										25,000	[1],[2]	272,000	[2]	272,000	[2]							186
Loss on disposal and restructuring costs																		447,000
Increase in tax expense																				1,400,000
Overstated post retirements benefit expense amount			$ 100,000		$ 100,000	$ 100,000

[1] Included in operating loss and net loss is $0.4 million loss on disposal and restructuring costs.

[2] The Company recorded an additional $1.4 milion in tax expense, compared to what was previously reported in its Annual Report on Form 10-K/A for the year ended December 31, 2012 (see Note 1).

[3] There is no difference between basic and diluted earnings (loss) per share due to stock options being out of the money.