CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating revenue:
Equipment	$ 15,364	$ 15,299
Services	33,405	31,645
Total operating revenue	48,769	46,944
Costs and expenses:
Cost of sales, excluding depreciation and amortization	13,222	13,466
Cost of services, excluding depreciation and amortization	16,599	15,326
Selling, general and administrative expenses	7,449	6,706
Asset Impairment Charges	633	0
Depreciation and amortization	7,009	6,194
Total costs and expenses	44,912	41,692
Operating income	3,857	5,252
Other income and expense:
Interest and other income	2	20
Interest expense	(1,139)	(1,411)
Total other (expense)	(1,137)	(1,391)
Income before income taxes	2,720	3,861
Income tax provision	1,094	1,567
Net income	$ 1,626	$ 2,294
Basic earnings per share	$ 0.12	$ 0.17
Weighted average common shares outstanding	13,556,515	13,349,791
Diluted earnings per share	$ 0.12	$ 0.17
Weighted average common and equivalent shares outstanding	13,578,429	13,405,357
Dividends per share	$ 0.145	$ 0.14