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Note E - Segment Information (Details) - Revenue by Operating 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]
Amount (in Dollars)	$ 79,163	$ 74,432	$ 237,648	$ 223,300
Percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Amount (in Dollars)	73,857	68,518	219,471	204,665
Percentage	93.30%	92.10%	92.40%	91.70%
Brokerage and Logistics Services [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Amount (in Dollars)	$ 5,306	$ 5,914	$ 18,177	$ 18,635
Percentage	6.70%	7.90%	7.60%	8.30%

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=28364263&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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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