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Note 3 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues	$ 158,744	$ 156,341
Operating income (loss)	309	7,418
Operating Segments [Member] | Truckload [Member]
Revenues	145,625	142,754
Operating income (loss)	3,902	8,369
Operating Segments [Member] | Other Segments [Member]
Revenues	13,119	13,587
Operating income (loss)	1,447	1,825
Corporate, Non-Segment [Member]
Operating income (loss)	$ (5,040)	$ (2,776)

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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