Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating revenues:
Operating revenues	$ 7,894	$ 7,604	$ 15,648	$ 15,128
Operating expenses:
Cost of services and products (exclusive of depreciation and amortization expense)	3,343	2,867	6,486	5,919
Selling, general and administration expenses	5,594	5,262	10,649	10,960
Depreciation and amortization	1,250	919	2,492	1,822
Restructuring costs and other special charges				100
Total operating expenses	10,187	9,048	19,627	18,801
Operating loss	(2,293)	(1,444)	(3,979)	(3,673)
Other income:
Interest income (expense), net	3	(54)	12	(193)
Income from investment		50,333		52,373
Other (expense) income, net	(11)	6	1,490	27
Total other (expense) income, net	(8)	50,285	1,502	52,207
(Loss) income before income taxes	(2,301)	48,841	(2,477)	48,534
Income tax (benefit) expense	(475)	17,304	(457)	17,246
Net (loss) income	(1,826)	31,537	(2,020)	31,288
Preferred dividends	7	7	13	13
Net (loss) income applicable to common stock	$ (1,833)	$ 31,530	$ (2,033)	$ 31,275
Basic (loss) earnings per common share	$ (0.31)	$ 5.19	$ (0.35)	$ 5.11
Diluted (loss) earnings per common share	$ (0.31)	$ 5.19	$ (0.35)	$ 5.11
Weighted average shares of common stock used to calculate loss per common share:
Basic	5,859	5,917	5,844	5,842
Diluted	5,859	5,917	5,844	5,842
Dividends declared per common share	$ 2.60		$ 2.60
Unified Communications [Member]
Operating revenues:
Operating revenues	$ 4,524	$ 4,234	$ 8,985	$ 8,445
Operating expenses:
Cost of services and products (exclusive of depreciation and amortization expense)	2,338	1,889	4,501	3,915
Selling, general and administration expenses	3,614	3,351	6,737	7,012
Depreciation and amortization	867	539	1,727	1,060
Restructuring costs and other special charges				56
Total operating expenses	6,819	5,779	12,965	12,043
Operating loss	(2,295)	(1,545)	(3,980)	(3,598)
Telephone [Member]
Operating revenues:
Operating revenues	3,370	3,370	6,663	6,683
Operating expenses:
Cost of services and products (exclusive of depreciation and amortization expense)	1,005	978	1,985	2,004
Selling, general and administration expenses	1,980	1,911	3,912	3,948
Depreciation and amortization	383	380	765	762
Restructuring costs and other special charges				44
Total operating expenses	3,368	3,269	6,662	6,758
Operating loss	$ 2	$ 101	$ 1	$ (75)