CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Operating revenue:
Equipment	$ 12,915	$ 14,269	$ 38,954	$ 31,499
Services	32,898	30,975	97,660	92,475
Total operating revenue	45,813	45,244	136,614	123,974
Costs and expenses:
Cost of sales, excluding depreciation and amortization	10,906	12,223	33,664	27,146
Cost of services, excluding depreciation and amortization	16,358	14,738	47,589	44,244
Selling, general and administrative expenses	7,123	6,147	21,270	19,419
Depreciation and amortization	6,869	5,794	19,795	17,155
Total costs and expenses	41,256	38,902	122,318	107,964
Operating income	4,557	6,342	14,296	16,010
Other income and expense:
Interest and other income	3	26	37	50
Interest expense	(1,625)	(2,880)	(4,635)	(5,199)
Total other (expense)	(1,622)	(2,854)	(4,598)	(5,149)
Income before income taxes	2,935	3,488	9,698	10,861
Income tax provision	1,194	1,355	3,925	4,034
Net income	$ 1,741	$ 2,133	$ 5,773	$ 6,827
Basic earnings per share	$ 0.13	$ 0.16	$ 0.43	$ 0.51
Weighted average common shares outstanding	13,511,009	13,394,225	13,483,358	13,363,874
Diluted earnings per share	$ 0.13	$ 0.16	$ 0.43	$ 0.51
Weighted average common and equivalent shares outstanding	13,526,875	13,409,414	13,498,268	13,376,261
Dividends per share	$ 0.14	$ 0.135	$ 0.42	$ 0.405