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Note 3 - Segment Information (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
(in thousands)
 
Three months ended
June 30,
   
Six months ended
June 30,
 
   
2016
   
2015
   
2016
   
2015
 
Total Revenues:
                               
Truckload
  $ 144,698     $ 162,800     $ 287,452     $ 320,048  
Other
    14,134       12,651       27,721       22,618  
                                 
Total
  $ 158,832     $ 175,451     $ 315,173     $ 342,666  
                                 
Operating Income:
                               
Truckload
  $ 8,681     $ 16,749     $ 17,051     $ 30,879  
Other
    1,489       580       3,314       917  
Unallocated Corporate Overhead
    (2,854 )     1,445       (5,630 )     (2,980 )
                                 
Total
  $ 7,316     $ 18,774     $ 14,735     $ 28,816