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Note 3 - Segment Information (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
(in thousands)
 
Three months ended
June 30,
   
Six months ended
June 30,
 
   
2018
   
2017
   
2018
   
2017
 
Total Revenues:
                               
Truckload
  $
170,711
    $
147,631
    $
325,259
    $
293,256
 
Managed Freight
   
25,607
     
16,695
     
44,625
     
29,814
 
                                 
Total
  $
196,318
    $
164,326
    $
369,884
    $
323,070
 
                                 
Operating Income:
                               
Truckload
  $
11,734
    $
2,377
    $
17,095
    $
1,239
 
Managed Freight
   
2,331
     
1,585
     
3,395
     
3,032
 
                                 
Total
  $
14,065
    $
3,962
    $
20,490
    $
4,271