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Note 3 - Segment Information (Details) - Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Total Revenues:
Total revenue	$ 173,654	$ 172,488	$ 334,611	$ 337,219
Operating Income (Loss):
Operating income (loss)	9,056	6,350	9,410	5,635
Operating Segments [Member] \| Truckload [Member]
Total Revenues:
Total revenue	160,338	161,884	310,593	319,405
Operating Income (Loss):
Operating income (loss)	12,065	7,967	12,515	11,138
Operating Segments [Member] \| Other Segments [Member]
Total Revenues:
Total revenue	13,316	10,604	24,018	17,814
Operating Income (Loss):
Operating income (loss)	565	475	1,106	208
Corporate, Non-Segment [Member]
Operating Income (Loss):
Operating income (loss)	$ (3,574)	$ (2,092)	$ (4,211)	$ (5,711)