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Note E - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Truckload Services [Member]
Revenue, before fuel surcharge	$ 80,220	$ 76,036	$ 232,261	$ 220,860
Percentage of revenue, before fuel surcharges	87.10%	92.50%	87.40%	92.90%
Brokerage and Logistics Services [Member]
Revenue, before fuel surcharge	$ 11,856	$ 6,122	$ 33,552	$ 16,800
Percentage of revenue, before fuel surcharges	12.90%	7.50%	12.60%	7.10%
Revenue, before fuel surcharge	$ 92,076	$ 82,158	$ 265,813	$ 237,660
Percentage of revenue, before fuel surcharges	100.00%	100.00%	100.00%	100.00%

X

- Definition

Revenue from transporting cargo and freight between locations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



-Section 50



-Paragraph 18



-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592



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-Publisher FASB



-Name Accounting Standards Codification



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