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Note 3 - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Segments [Member] | Truckload [Member]
Revenues	$ 159,615	$ 166,839	$ 479,664	$ 477,432
Operating income (loss)	15,983	10,854	46,799	23,369
Operating Segments [Member] | Other Segments [Member]
Revenues	13,897	10,742	36,514	34,760
Operating income (loss)	923	483	1,840	1,590
Corporate, Non-Segment [Member]
Operating income (loss)	(2,277)	(5,751)	(5,193)	(9,964)
Revenues	173,512	177,581	516,178	512,192
Operating income (loss)	$ 14,629	$ 5,586	$ 43,446	$ 14,995

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=26872669&loc=d3e20235-122688

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