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Note 3 - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Segments [Member] | Truckload [Member]
Revenues	$ 144,698	$ 162,800	$ 287,452	$ 320,048
Operating income (loss)	8,681	16,749	17,051	30,879
Operating Segments [Member] | Other Segments [Member]
Revenues	14,134	12,651	27,721	22,618
Operating income (loss)	1,489	580	3,314	917
Corporate, Non-Segment [Member]
Operating income (loss)	(2,854)	1,445	(5,630)	(2,980)
Revenues	158,832	175,451	315,173	342,666
Operating income (loss)	$ 7,316	$ 18,774	$ 14,735	$ 28,816

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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