Condensed Consolidated Statements of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
OPERATING REVENUES:
Revenue, before fuel surcharge	$ 79,163	$ 74,432	$ 237,648	$ 223,300
Fuel surcharge	22,715	20,117	68,619	61,560
Total operating revenues	101,878	94,549	306,267	284,860
OPERATING EXPENSES AND COSTS:
Salaries, wages and benefits	26,288	26,346	81,069	81,728
Fuel expense	23,500	26,426	74,702	84,662
Rent and purchased transportation	22,217	14,388	64,509	38,135
Depreciation	9,676	9,639	29,536	28,193
Operating supplies and expenses	8,780	10,303	26,441	29,746
Operating taxes and licenses	1,162	1,246	3,662	3,726
Insurance and claims	3,717	3,487	10,965	10,082
Communications and utilities	558	533	1,678	1,660
Other	1,764	1,088	5,090	3,721
(Gain) loss on disposition of equipment	(468)	154	(823)	(90)
Total operating expenses and costs	97,194	93,610	296,829	281,563
OPERATING INCOME	4,684	939	9,438	3,297
NON-OPERATING INCOME	130	1,188	702	2,677
INTEREST EXPENSE	(846)	(645)	(2,540)	(1,811)
INCOME BEFORE INCOME TAXES	3,968	1,482	7,600	4,163
FEDERAL AND STATE INCOME TAX EXPENSE:
Current	9	35	9	35
Deferred	1,566	566	2,972	1,638
Total federal and state income tax expense	1,575	601	2,981	1,673
NET INCOME	$ 2,393	$ 881	$ 4,619	$ 2,490
INCOME PER COMMON SHARE:
Basic (in Dollars per share)	$ 0.28	$ 0.10	$ 0.53	$ 0.29
Diluted (in Dollars per share)	$ 0.28	$ 0.10	$ 0.53	$ 0.29
AVERAGE COMMON SHARES OUTSTANDING:
Basic (in Shares)	8,654	8,702	8,667	8,700
Diluted (in Shares)	8,663	8,703	8,671	8,702
DIVIDENDS DECLARED PER COMMON SHARE (in Dollars per share)				$ 1.00