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Note 11 - Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating revenue	$ 173,159	$ 161,929
Operating Income	13,938	14,125
Truckload [Member]
Operating revenue	95,658	90,054
Operating Income	5,974	6,940
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	84,811	82,942
Truckload [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	10,847	7,112
Dedicated [Member]
Operating revenue	40,277	37,097
Operating Income	4,487	4,324
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	36,899	35,510
Dedicated [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	3,378	1,587
Intermodal [Member]
Operating revenue	19,186	17,201
Operating Income	2,149	1,929
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue	16,811	15,854
Intermodal [Member] | Fuel Surcharge Revenue [Member]
Operating revenue	2,375	1,347
Brokerage [Member]
Operating revenue	18,038	17,577
Operating Income	$ 1,328	$ 932

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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