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Note E - Segment Information (Details) - Segments Revenue Reconciliation (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, before fuel surcharge	$ 80,606	$ 80,657	$ 155,502	$ 158,485
Truckload Services [Member] | Sales Revenue, Segment [Member] | Product Concentration Risk [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Percentage of revenue, before fuel surcharges	93.50%	92.60%	93.10%	91.90%
Truckload Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, before fuel surcharge	75,377	74,706	144,824	145,614
Brokerage and Logistics Services [Member] | Sales Revenue, Segment [Member] | Product Concentration Risk [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Percentage of revenue, before fuel surcharges	6.50%	7.40%	6.90%	8.10%
Brokerage and Logistics Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, before fuel surcharge	$ 5,229	$ 5,951	$ 10,678	$ 12,871
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%

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=26872669&loc=d3e20235-122688

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X

- 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 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: 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=6927468&loc=d3e6404-108592



Reference 3: 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=35750535&loc=d3e13531-108611



Reference 4: 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=6927468&loc=d3e6351-108592

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