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

Three Months

    Nine Months  
   

Ended September 30,

    Ended September 30,  

(In thousands)

 

2014

   

2013

   

2014

   

2013

 

Operating revenue:

                               

Truckload revenue, net of fuel surcharge revenue

  $ 105,271     $ 103,145     $ 304,962     $ 298,106  

Truckload fuel surcharge revenue

    25,816       27,135       79,294       80,760  

Total Truckload revenue

    131,087       130,280       384,256       378,866  
                                 

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

    34,670       31,397       98,197       98,878  

Intermodal fuel surcharge revenue

    5,793       5,426       16,929       15,246  

Total Logistics revenue

    40,463       36,823       115,126       114,124  
                                 

Total operating revenue

  $ 171,550     $ 167,103     $ 499,382     $ 492,990  
                                 

Operating income:

                               

Truckload

  $ 12,501     $ 12,267     $ 31,844     $ 33,643  

Logistics

    541       1,386       2,770       5,669  

Total operating income

  $ 13,042     $ 13,653     $ 34,614     $ 39,312