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Note 3 - Segment Information (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
(in thousands)
 
Three months ended
June 30,
   
Six months ended
June 30,
 
   
2017
   
2016
   
2017
   
2016
 
Total Revenues:
                               
Truckload
  $
147,631
    $
144,698
    $
293,2568
    $
287,452
 
Other
   
16,695
     
14,134
     
29,814
     
27,721
 
                                 
Total Revenues
  $
164,326
    $
158,832
    $
323,070
    $
315,173
 
                                 
Operating Income:
                               
Truckload
  $
4,986
    $
8,681
    $
8,888
    $
17,051
 
Other
   
1,585
     
1,489
     
3,032
     
3,314
 
Unallocated Corporate Overhead
   
(2,609
)    
(2,854
)    
(7,649
)    
(5,630
)
                                 
Total Operating Income
  $
3,962
    $
7,316
    $
4,271
    $
14,735