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Note F - Segment Information (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2018
   
2017
   
2018
   
2017
 
   
Amount
   
%
   
Amount
   
%
   
Amount
   
%
   
Amount
   
%
 
   
(in thousands, except percentage data)
 
                                                                 
Truckload Services revenue
  $
89,131
     
79.0
    $
81,656
     
87.7
    $
169,655
     
80.0
    $
164,575
     
88.1
 
Brokerage and Logistics Services revenue
   
23,750
     
21.0
     
11,441
     
12.3
     
42,330
     
20.0
     
22,125
     
11.9
 
Total revenues
  $
112,881
     
100.0
    $
93,097
     
100.0
    $
211,985
     
100.0
    $
186,700
     
100.0