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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%

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