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Note E - Segment Information (Details) - Segment Revenue Reconciliation - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, before fuel surcharge	$ 91,053	$ 80,606	$ 173,737	$ 155,502
Truckload Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, before fuel surcharge	79,512	75,377	152,041	144,824
Brokerage and Logistics Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, before fuel surcharge	$ 11,541	$ 5,229	$ 21,696	$ 10,678
Sales Revenue, Segment [Member] | Product Concentration Risk [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Percentage of revenue, before fuel surcharges	100.00%	100.00%	100.00%	100.00%
Sales Revenue, Segment [Member] | Product Concentration Risk [Member] | Truckload Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Percentage of revenue, before fuel surcharges	87.30%	93.50%	87.50%	93.10%
Sales Revenue, Segment [Member] | Product Concentration Risk [Member] | Brokerage and Logistics Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Percentage of revenue, before fuel surcharges	12.70%	6.50%	12.50%	6.90%

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



-Subparagraph (SX 210.5-03.1(d))



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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



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



-SubTopic 10



-Section 50



-Paragraph 20



-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



-Section 50



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Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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+ References

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