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Note 3 - Segment Information (Details) - Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Total Revenues:
Total revenue	$ 177,581	$ 170,843	$ 512,192	$ 508,061
Operating Income (Loss):
Operating income (loss)	5,586	5,882	14,995	11,517
Operating Segments [Member] \| Truckload [Member]
Total Revenues:
Total revenue	166,839	160,107	477,432	479,511
Operating Income (Loss):
Operating income (loss)	10,854	6,831	23,369	17,969
Operating Segments [Member] \| Other Segments [Member]
Total Revenues:
Total revenue	10,742	10,736	34,760	28,550
Operating Income (Loss):
Operating income (loss)	483	366	1,590	575
Corporate, Non-Segment [Member]
Operating Income (Loss):
Operating income (loss)	$ (5,751)	$ (1,315)	$ (9,964)	$ (7,027)