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Note E - Segment Information (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2016
   
2015
   
2016
   
2015
 
   
Amount
   
%
   
Amount
   
%
   
Amount
   
%
   
Amount
   
%
 
   
(in thousands, except percentage data)
 
Truckload Services revenue
  $ 86,880       87.8     $ 79,512       87.3     $ 168,987       87.8     $ 152,040       87.5  
Brokerage and Logistics Services revenue
    12,041       12.2       11,541       12.7       23,583       12.2       21,697       12.5  
Total revenues
  $ 98,921       100.0     $ 91,053       100.0     $ 192,570       100.0     $ 173,737       100.0