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Note 3 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating Segments [Member] | Truckload [Member]
Revenues	$ 148,603	$ 159,615	$ 436,055	$ 479,664
Operating income (loss)	5,508	15,983	22,558	46,799
Operating Segments [Member] | Other Segments [Member]
Revenues	15,897	13,897	43,618	36,514
Operating income (loss)	1,829	923	5,144	1,840
Corporate, Non-Segment [Member]
Operating income (loss)	(1,891)	(2,277)	(7,521)	(5,193)
Revenues	164,500	173,512	479,673	516,178
Operating income (loss)	$ 5,446	$ 14,629	$ 20,181	$ 43,446

X

- Definition

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

+ References

No definition available.

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X

- 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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