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Note E - Segment Information (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
   
Three Months Ended March 31,
 
   
2016
   
2015
 
   
Amount
   
%
   
Amount
   
%
 
   
(in thousands, except percentage data)
 
Truckload Services revenue
  $ 82,107       87.7     $ 72,529       87.7  
Brokerage and Logistics Services revenue
    11,542       12.3       10,155       12.3  
Total revenues
  $ 93,649       100.0     $ 82,684       100.0