Consolidated Condensed Statements of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Consolidated Condensed Statements of Operations (unaudited) [Abstract]
Total operating revenue	$ 102,436	$ 95,705	$ 200,267	$ 183,640
Operating expenses
Salaries, wages and related expenses	29,367	28,078	58,374	57,303
Purchased transportation	22,056	16,487	41,702	32,320
Fuel	17,396	19,752	36,345	38,769
Supplies and maintenance	13,768	12,362	26,721	24,766
Revenue equipment rent	11,798	10,302	23,998	20,514
Depreciation	2,728	2,908	5,610	5,967
Communications and utilities	1,099	1,243	2,106	2,176
Claims and insurance	3,793	1,864	7,205	3,769
Operating taxes and licenses	997	1,065	1,957	2,152
Gain on sale of property and equipment	(301)	(777)	(567)	(2,537)
Miscellaneous	1,314	864	2,425	2,097
Total operating expenses	104,015	94,148	205,876	187,296
(Loss) income from operations	(1,579)	1,557	(5,609)	(3,656)
Interest and other (income) expense
Interest expense	543	398	1,169	769
Equity in loss (earnings) of limited partnership	0	(97)	10	(332)
Gain on sale of investment in limited partnership	0	0	(1,649)	0
Other	440	129	626	371
Total interest and other (income) expense	983	430	156	808
(Loss) income before income taxes	(2,562)	1,127	(5,765)	(4,464)
Income tax expense	41	56	93	114
Net (loss) income	$ (2,603)	$ 1,071	$ (5,858)	$ (4,578)
Net (loss) income per share of common stock
Basic (in dollars per share)	$ (0.14)	$ 0.06	$ (0.33)	$ (0.26)
Diluted (in dollars per share)	$ (0.14)	$ 0.06	$ (0.33)	$ (0.26)
Weighted average shares outstanding
Basic (in shares)	18,028	17,872	17,976	17,799
Diluted (in shares)	18,028	17,872	17,976	17,799