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Note 4 - Segment Reporting (Tables)
3 Months Ended
Mar. 31, 2015
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Three Months Ended

 
   

March 31,

 
   

2015

   

2014

 

Operating revenue

               

Trucking revenue (1)

  $ 96,402     $ 102,914  

Trucking intersegment eliminations

    (615 )     (148 )

Trucking operating revenue

    95,787       102,766  

SCS revenue

    38,671       45,252  

SCS intersegment eliminations

    (1,571 )     (2,529 )

SCS operating revenue

    37,100       42,723  

Total operating revenue

  $ 132,887     $ 145,489  
   

Three Months Ended

 
   

March 31,

 
   

2015

   

2014

 

Operating income (loss)

               

Trucking

  $ 615     $ (6,120 )

SCS

    2,976       5,077  

Total operating income (loss)

  $ 3,591     $ (1,043 )
   

Three Months Ended

 
   

March 31,

 
   

2015

   

2014

 

Depreciation and amortization

               

Trucking

  $ 10,613     $ 11,406  

SCS

    58       49  

Total depreciation and amortization

  $ 10,671     $ 11,455