Quarterly Segment Financial Summary (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Segment Reporting Information			3
Revenue from unaffiliated customers	$ 43,857	$ 40,108	$ 90,801	$ 78,730
Intersegment revenue	0		0	0
Total operating revenue	43,857	40,108	90,801	78,730
Depreciation and amortization	6,732	5,682	12,926	11,361
Operating income	4,487	5,002	9,739	9,668
Interest expense	1,482	1,015	2,846	2,083
Income tax provision (benefit)	1,210	1,307	2,796	2,773
Net income (loss)	1,809	2,694	4,131	4,836
Total assets	264,586	237,224	264,586	237,224	243,986
Property, plant and equipment, net	174,150	152,495	174,150	152,495	153,930
Additions to property, plant and equipment	5,923	4,813	9,557	8,555
Fiber and Data Segment [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers	15,177	11,067	28,396	21,928
Intersegment revenue	193	186	386	347
Total operating revenue	15,370	11,253	28,782	22,275
Depreciation and amortization	2,551	1,556	4,517	3,142
Operating income	2,284	1,922	4,629	3,407
Interest expense	0	0	0	0
Income tax provision (benefit)	925	778	1,875	1,381
Net income (loss)	1,359	1,144	2,754	2,027
Total assets	103,611	68,819	103,611	68,819
Property, plant and equipment, net	84,216	55,881	84,216	55,881
Additions to property, plant and equipment	3,603	2,417	5,568	4,223
Equipment Segment [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers	12,864	11,746	30,285	22,170
Intersegment revenue	0	0	0	0
Total operating revenue	12,864	11,746	30,285	22,170
Depreciation and amortization	71	71	142	139
Operating income	399	706	1,219	1,204
Interest expense	0	1	0	1
Income tax provision (benefit)	160	286	494	489
Net income (loss)	239	419	725	714
Total assets	14,753	19,615	14,753	19,615
Property, plant and equipment, net	1,433	1,209	1,433	1,209
Additions to property, plant and equipment	117	87	190	93
Telecom Segment [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers	15,816	17,295	32,120	34,632
Intersegment revenue	444	404	854	816
Total operating revenue	16,260	17,699	32,974	35,448
Depreciation and amortization	4,085	4,033	8,218	8,036
Operating income	1,993	2,699	4,180	5,600
Interest expense	9	15	22	33
Income tax provision (benefit)	809	1,089	1,692	2,257
Net income (loss)	1,186	1,599	2,485	3,315
Total assets	121,064	128,060	121,064	128,060
Property, plant and equipment, net	88,424	95,301	88,424	95,301
Additions to property, plant and equipment	2,203	2,309	3,799	4,239
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers	0	0	0	0
Intersegment revenue	(637)	(590)	(1,240)	(1,163)
Total operating revenue	(637)	(590)	(1,240)	(1,163)
Depreciation and amortization	25	22	49	44
Operating income	(189)	(325)	(289)	(543)
Interest expense	1,473	999	2,824	2,049
Income tax provision (benefit)	(684)	(846)	(1,265)	(1,354)
Net income (loss)	(975)	(468)	(1,833)	(1,220)
Total assets	25,158	20,730	25,158	20,730
Property, plant and equipment, net	77	104	77	104
Additions to property, plant and equipment	$ 0	$ 0	$ 0	$ 0