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Note 11 - Business Segments (Tables)
6 Months Ended
Jun. 30, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Three Months

   

Six Months

 
   

Ended June 30,

   

Ended June 30,

 

(In thousands)

 

2014

   

2013

   

2014

   

2013

 

Operating revenue:

                               

Truckload revenue, net of fuel surcharge revenue

  $ 102,161     $ 99,996     $ 199,691     $ 194,961  

Truckload fuel surcharge revenue

    26,944       26,856       53,478       53,625  

Total Truckload revenue

    129,105       126,852       253,169       248,586  
                                 

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

    33,518       29,721       63,527       67,481  

Intermodal fuel surcharge revenue

    5,800       4,840       11,136       9,820  

Total Logistics revenue

    39,318       34,561       74,663       77,301  
                                 

Total operating revenue

  $ 168,423     $ 161,413     $ 327,832     $ 325,887  
                                 

Operating income:

                               

Truckload

  $ 11,843     $ 11,376     $ 19,343     $ 21,376  

Logistics

    1,089       1,745       2,229       4,283  

Total operating income

  $ 12,932     $ 13,121     $ 21,572     $ 25,659