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Note F - Segment Information (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
   
Three Months Ended March 31,
 
   
2019
   
2018
 
   
Amount
   
%
   
Amount
   
%
 
   
(in thousands, except percentage data)
 
                                 
Truckload Services revenue
  $
90,013
     
81.6
    $
80,524
     
81.3
 
Brokerage and Logistics Services revenue
   
20,332
     
18.4
     
18,580
     
18.7
 
Total revenues
  $
110,345
     
100.0
    $
99,104
     
100.0