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Note 11 - Business Segments (Details) - Operating Revenue and Operating Income by Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information [Line Items]
Operating Revenue	$ 167,103		$ 163,606		$ 492,990		$ 472,044
Operating Income	13,653		9,840		39,312		32,642
Truckload Revenue, Net of Fuel Surcharge [Member]
Segment Reporting Information [Line Items]
Operating Revenue	103,145		96,938		298,106		280,284
Truckload Fuel Surcharge Revenue [Member]
Segment Reporting Information [Line Items]
Operating Revenue	27,135		25,931		80,760		77,305
Total Truckload Revenue [Member]
Segment Reporting Information [Line Items]
Operating Revenue	130,280		122,869		378,866		357,589
Logistics Revenue, Net of Intermodal Fuel Surcharge [Member]
Segment Reporting Information [Line Items]
Operating Revenue	31,397	[1]	36,408	[1]	98,878	[1]	102,889	[1]
Intermodal Fuel Surcharge Revenue [Member]
Segment Reporting Information [Line Items]
Operating Revenue	5,426		4,329		15,246		11,566
Total Logistics Revenue [Member]
Segment Reporting Information [Line Items]
Operating Revenue	36,823		40,737		114,124		114,455
Truckload [Member]
Segment Reporting Information [Line Items]
Operating Income	12,267		7,938		33,643		26,039
Logistics [Member]
Segment Reporting Information [Line Items]
Operating Income	$ 1,386		$ 1,902		$ 5,669		$ 6,603
[1] Logistics revenue is net of $2.1 million of inter-segment revenue in the nine-month period ended September 30, 2013 for loads transported by our tractors and arranged by MWL prior to the deconsolidation of MWL effective March 28, 2013. Such revenue has been eliminated in consolidation. Inter-segment revenue was $2.3 million and $7.2 million for the three-month and nine-month periods ended September 30, 2012.

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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