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Note 15 - Business Segments (Tables)
12 Months Ended
Dec. 31, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]

(Dollars in thousands)

 

2014

   

2013

   

2012

 

Operating revenue:

                       

Truckload revenue, net of fuel surcharge revenue

  $ 358,458     $ 366,798     $ 363,645  

Truckload fuel surcharge revenue

    89,815       98,161       100,067  

Total Truckload revenue

    448,273       464,959       463,712  
                         

Dedicated revenue, net of fuel surcharge revenue

    56,609       33,526       14,738  

Dedicated fuel surcharge revenue

    13,743       8,794       4,873  

Total Dedicated revenue

    70,352       42,320       19,611  
                         

Intermodal revenue, net of fuel surcharge revenue

    75,447       71,764       55,151  

Intermodal fuel surcharge revenue

    21,645       20,749       16,173  

Total Intermodal revenue

    97,092       92,513       71,324  
                         

Brokerage revenue:

                       

Marten Transport

    57,212       52,746       53,161  

MWL(1)

    -       6,676       30,648  

Total Brokerage revenue

    57,212       59,422       83,809  
                         

Total operating revenue

  $ 672,929     $ 659,214     $ 638,456  
                         

Operating income:

                       

Truckload

  $ 39,483     $ 39,290     $ 33,715  

Dedicated

    7,136       5,575       3,090  

Intermodal

    1,735       4,014       4,703  

Brokerage

    2,652       3,116       4,345  

Total operating income

  $ 51,006     $ 51,995     $ 45,853