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Note E - Segment Information (Details) - Segments Revenue Reconciliation (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenue, before fuel surcharge | $ 74,896 | $ 77,828
Truckload Services [Member] | Product Concentration Risk [Member] | Sales Revenue, Segment [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Percentage of revenue, before fuel surcharges | 92.70% | 91.10%
Truckload Services [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenue, before fuel surcharge | 69,447 | 70,908
Brokerage and Logistics Services [Member] | Product Concentration Risk [Member] | Sales Revenue, Segment [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Percentage of revenue, before fuel surcharges | 7.30% | 8.90%
Brokerage and Logistics Services [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenue, before fuel surcharge | $ 5,449 | $ 6,920
Product Concentration Risk [Member] | Sales Revenue, Segment [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Percentage of revenue, before fuel surcharges | 100.00% | 100.00%

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