CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Operating revenue:
Equipment	$ 9,035	$ 8,068	$ 17,230	$ 17,952
Services	31,073	30,200	61,500	59,036
Total operating revenue	40,108	38,268	78,730	76,988
Costs and expenses:
Cost of sales, excluding depreciation and amortization	7,924	6,974	14,923	15,449
Cost of services, excluding depreciation and amortization	14,771	14,766	29,506	28,944
Selling, general and administrative expenses	6,729	5,560	13,272	11,756
Depreciation	5,593	5,222	11,184	10,544
Amortization of intangibles	89	89	177	178
Total costs and expenses	35,106	32,611	69,062	66,871
Operating income	5,002	5,657	9,668	10,117
Other income and expense:
Interest and other income	14	14	24	51
Interest expense	(1,015)	(1,101)	(2,083)	(2,692)
Total other (expense)	(1,001)	(1,087)	(2,059)	(2,641)
Income before income taxes	4,001	4,570	7,609	7,476
Income tax provision	1,307	1,060	2,773	2,539
Net income	$ 2,694	$ 3,510	$ 4,836	$ 4,937
Basic earnings per share (in dollars per share)	$ 0.20	$ 0.27	$ 0.36	$ 0.37
Weighted average common shares outstanding (in shares)	13,367,083	13,225,561	13,348,447	13,190,366
Diluted earnings per share (in dollars per share)	$ 0.20	$ 0.27	$ 0.36	$ 0.37
Weighted average common and equivalent shares outstanding (in shares)	13,380,186	13,230,861	13,360,949	13,197,666
Dividends per share (in dollars per share)	$ 0.135	$ 0.13	$ 0.27	$ 0.26