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Note 11 - Business Segments (Tables)
6 Months Ended
Jun. 30, 2013
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Three Months

Ended June 30,

   

Six Months

Ended June 30,

 

(Dollars in thousands)

 

2013

   

2012

   

2013

   

2012

 

Operating revenue:

                               

Truckload revenue, net of fuel surcharge revenue 

  $ 99,996     $ 94,148     $ 194,961     $ 183,346  

Truckload fuel surcharge revenue

    26,856       26,121       53,625       51,374  

Total Truckload revenue

    126,852       120,269       248,586       234,720  
                                 

Logistics revenue, net of intermodal fuel surcharge revenue(1) 

    29,721       33,045       67,481       66,481  

Intermodal fuel surcharge revenue

    4,840       3,650       9,820       7,237  

Total Logistics revenue

    34,561       36,695       77,301       73,718  
                                 

Total operating revenue

  $ 161,413     $ 156,964     $ 325,887     $ 308,438  
                                 

Operating income:

                               

Truckload

  $ 11,376     $ 10,973     $ 21,376     $ 18,101  

Logistics

    1,745       2,310       4,283       4,701  

Total operating income

  $ 13,121     $ 13,283     $ 25,659     $ 22,802