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Note 4 - Segment Reporting (Tables)
9 Months Ended
Sep. 30, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Operating Revenue

 
   

Three Months Ended

   

Nine Months Ended

 
   

September 30,

   

September 30,

 
   

2014

   

2013

   

2014

   

2013

 

Operating Revenue

                               

Trucking (1)

  $ 108,440     $ 104,944     $ 317,664     $ 311,761  

SCS

    49,359       38,650       144,507       107,510  

Eliminations

    (4,181 )     (1,772 )     (9,766 )     (5,684 )

Operating revenue

  $ 153,618     $ 141,822     $ 452,405     $ 413,587  
   

Operating Income (Loss)

 
   

Three Months Ended

   

Nine Months Ended

 
   

September 30,

   

September 30,

 
   

2014

   

2013

   

2014

   

2013

 

Operating Income (Loss)

                               

Trucking

  $ 83     $ (2,968 )   $ (7,772 )   $ (10,054 )

SCS

    5,336       2,764       16,405       6,079  

Operating income (loss)

  $ 5,419     $ (204 )   $ 8,633     $ (3,975 )
   

Depreciation and Amortization

 
   

Three Months Ended

   

Nine Months Ended

 
   

September 30,

   

September 30,

 
   

2014

   

2013

   

2014

   

2013

 

Depreciation and Amortization

                               

Trucking

  $ 10,625     $ 11,583     $ 33,136     $ 33,208  

SCS

    46       50       138       191  

Total depreciation and amortization

  $ 10,671     $ 11,633     $ 33,274     $ 33,399