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

Three Months

Ended September 30,

   

Nine Months

Ended September 30,

 

(Dollars in thousands)

 

2013

   

2012

   

2013

   

2012

 

Operating revenue:

                               

Truckload revenue, net of fuel surcharge revenue

  $ 103,145     $ 96,938     $ 298,106     $ 280,284  

Truckload fuel surcharge revenue

    27,135       25,931       80,760       77,305  

Total Truckload revenue

    130,280       122,869       378,866       357,589  
                                 

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

    31,397       36,408       98,878       102,889  

Intermodal fuel surcharge revenue

    5,426       4,329       15,246       11,566  

Total Logistics revenue

    36,823       40,737       114,124       114,455  
                                 

Total operating revenue

  $ 167,103     $ 163,606     $ 492,990     $ 472,044  
                                 

Operating income:

                               

Truckload

  $ 12,267     $ 7,938     $ 33,643     $ 26,039  

Logistics

    1,386       1,902       5,669       6,603  

Total operating income

  $ 13,653     $ 9,840     $ 39,312     $ 32,642