CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating revenue:
Services	$ 35,671	$ 34,231	$ 69,884	$ 67,636
Equipment	14,052	12,910	24,079	28,274
Total operating revenue	49,723	47,141	93,963	95,910
Costs and expenses:
Cost of sales, excluding depreciation and amortization	12,357	10,860	20,901	24,082
Cost of services, excluding depreciation and amortization	17,335	16,971	33,995	33,570
Selling, general and administrative expenses	8,327	7,047	15,290	14,496
Asset impairment	0	5	0	638
Depreciation and amortization	7,510	7,252	15,090	14,261
Total costs and expenses	45,529	42,135	85,276	87,047
Operating income	4,194	5,006	8,687	8,863
Other income and expense:
Interest and other income	8	13	8	15
Interest expense	(991)	(1,131)	(1,970)	(2,270)
Total other expense	(983)	(1,118)	(1,962)	(2,255)
Income before income taxes	3,211	3,888	6,725	6,608
Income tax provision	1,300	1,567	2,741	2,661
Net income	$ 1,911	$ 2,321	$ 3,984	$ 3,947
Basic earnings per share	$ 0.14	$ 0.17	$ 0.29	$ 0.29
Weighted average common shares outstanding	13,641,564	13,531,007	13,619,055	13,543,690
Diluted earnings per share	$ 0.14	$ 0.17	$ 0.29	$ 0.29
Weighted average common and equivalent shares outstanding	13,696,119	13,576,967	13,679,378	13,584,749
Dividends per share	$ 0.15	$ 0.145	$ 0.30	$ 0.29