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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%