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Note F - Segment Information (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2019
   
2018
   
2019
   
2018
 
   
Amount
   
%
   
Amount
   
%
   
Amount
   
%
   
Amount
   
%
 
   
(in thousands, except percentage data)
 
                                                                 
Truckload Services revenue
  $
92,867
     
82.7
    $
89,131
     
79.0
    $
182,879
     
82.1
    $
169,655
     
80.0
 
Brokerage and Logistics Services revenue
   
19,485
     
17.3
     
23,750
     
21.0
     
39,817
     
17.9
     
42,330
     
20.0
 
Total revenues
  $
112,352
     
100.0
    $
112,881
     
100.0
    $
222,696
     
100.0
    $
211,985
     
100.0