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Note 16 - Segment Information (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Year Ended December 31, 2015
 
Truckload
   
Other
   
Unallocated
Corporate
Overhead
   
Consolidated
 
Revenue
  $ 655,918     $ 71,057     $ -     $ 726,975  
Intersegment revenue
    -       (2,735 )     -       (2,735 )
Operating income (loss)
    74,107       5,768       (12,093 )     67,782  
Depreciation and amortization (1)
    60,138       13       1,233       61,384  
Total assets
    581,212       26,315       39,896       647,423  
Capital expenditures, net (2)
    147,896       29       1,069       148,994  
                                 
Year Ended December 31, 2014
                               
Revenue
  $ 663,001     $ 59,796     $ -     $ 722,797  
Intersegment revenue
    -       (3,817 )     -       (3,817 )
Operating income (loss)
    54,151       3,894       (18,399 )     39,646  
Depreciation and amortization (1)
    45,669       59       656       46,384  
Total assets
    463,900       27,338       48,066       539,304  
Capital expenditures, net (2)
    87,871       14       1,570       89,455  
                                 
Year Ended December 31, 2013
                               
Revenue
  $ 644,403     $ 51,702     $ -     $ 690,327  
Intersegment revenue
    -       (5,778 )     -       (5,778 )
Operating income (loss)
    27,746       1,271       (8,623 )     20,394  
Depreciation and amortization (1)
    42,848       72       775       43,694  
Total assets
    402,637       20,883       37,668       461,188  
Capital expenditures net (2)
    90,336       10       1,630       91,976