Quarterly Segment Financial Summary (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Segment Reporting Information			3
Total operating revenue	$ 47,088	$ 45,813	$ 142,998	$ 136,614
Asset impairment	0	0	638	0
Depreciation and amortization	7,514	6,869	21,775	19,795
Operating income	4,286	4,557	13,149	14,296
Interest expense	1,155	1,625	3,425	4,635
Income tax provision (benefit)	1,270	1,194	3,931	3,925
Net income (loss)	1,862	1,741	5,809	5,773
Total assets	260,958	268,750	260,958	268,750	268,304
Property, plant and equipment, net	181,682	176,803	181,682	176,803	182,959
Additions to property, plant and equipment	8,502	9,354	20,807	18,910
Fiber and Data Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	16,958	15,743	50,634	44,525
Asset impairment	0	0	638	0
Depreciation and amortization	3,078	2,638	8,796	7,155
Operating income	1,722	2,445	5,609	7,074
Interest expense	0	2	0	2
Income tax provision (benefit)	697	990	2,286	2,865
Net income (loss)	1,024	1,454	3,325	4,208
Total assets	114,725	109,869	114,725	109,869
Property, plant and equipment, net	95,817	88,157	95,817	88,157
Additions to property, plant and equipment	4,725	6,390	10,638	11,958
Equipment Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	15,338	15,001	47,691	45,286
Asset impairment	0	0	0	0
Depreciation and amortization	139	71	348	213
Operating income	1,031	890	2,786	2,109
Interest expense	0	0	0	0
Income tax provision (benefit)	417	360	1,132	854
Net income (loss)	614	529	1,654	1,254
Total assets	18,285	21,213	18,285	21,213
Property, plant and equipment, net	2,086	1,347	2,086	1,347
Additions to property, plant and equipment	31	(15)	992	175
Telecom Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	15,566	15,749	47,017	48,723
Asset impairment	0	0	0	0
Depreciation and amortization	4,289	4,146	12,608	12,364
Operating income	1,503	1,377	4,984	5,557
Interest expense	6	9	20	31
Income tax provision (benefit)	607	554	2,023	2,246
Net income (loss)	891	816	2,952	3,301
Total assets	116,081	120,056	116,081	120,056
Property, plant and equipment, net	83,688	87,237	83,688	87,237
Additions to property, plant and equipment	3,746	2,979	9,125	6,777
Telecom Segment [Member] | South Central Minnesota [Member]
Segment Reporting Information [Line Items]
Number of communities serviced by incumbent local exchange carrier operations			13
Telecom Segment [Member] | Rural Northwest Iowa [Member]
Segment Reporting Information [Line Items]
Number of communities serviced by incumbent local exchange carrier operations			13
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total operating revenue	(774)	(680)	(2,344)	(1,920)
Asset impairment	0	0	0	0
Depreciation and amortization	8	14	23	63
Operating income	30	(155)	(230)	(444)
Interest expense	1,149	1,614	3,405	4,602
Income tax provision (benefit)	(451)	(710)	(1,510)	(2,040)
Net income (loss)	(667)	(1,058)	(2,122)	(2,990)
Total assets	11,867	17,613	11,867	17,613
Property, plant and equipment, net	91	62	91	62
Additions to property, plant and equipment	0	0	52	0
Unaffiliated Customers [Member]
Segment Reporting Information [Line Items]
Total operating revenue	47,088	45,813	142,998	136,614
Unaffiliated Customers [Member] | Fiber and Data Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	16,736	15,528	49,986	43,924
Unaffiliated Customers [Member] | Equipment Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	15,338	15,001	47,691	45,286
Unaffiliated Customers [Member] | Telecom Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	15,014	15,284	45,321	47,404
Unaffiliated Customers [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total operating revenue	0	0	0	0
Intersegment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	0	0	0	0
Intersegment [Member] | Fiber and Data Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	222	215	648	601
Intersegment [Member] | Equipment Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	0	0	0	0
Intersegment [Member] | Telecom Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	552	465	1,696	1,319
Intersegment [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total operating revenue	$ (774)	$ (680)	$ (2,344)	$ (1,920)