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Note E - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Truckload Services [Member] | Product Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, before fuel surcharge, percentage	88.90%	87.10%	88.10%	87.40%
Truckload Services [Member]
Revenue, before fuel surcharge	$ 85,286	$ 80,220	$ 254,262	$ 232,261
Brokerage and Logistics Services [Member] | Product Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, before fuel surcharge, percentage	11.10%	12.90%	11.90%	12.60%
Brokerage and Logistics Services [Member]
Revenue, before fuel surcharge	$ 10,640	$ 11,856	$ 34,234	$ 33,552
Product Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, before fuel surcharge, percentage	100.00%	100.00%	100.00%	100.00%
Revenue, before fuel surcharge	$ 95,926	$ 92,076	$ 288,496	$ 265,813

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))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

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+ 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=64851502&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=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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