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Note 3 - Segment Information (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
(in thousands)
 
Three months ended
September 30,
   
Nine months ended
September 30,
 
   
2015
   
2014
   
2015
   
2014
 
Total Revenues:
                               
Truckload
  $ 159,615     $ 166,839     $ 479,664     $ 477,432  
Other
    13,897       10,742       36,514       34,760  
                                 
Total
  $ 173,512     $ 177,581     $ 516,178     $ 512,192  
                                 
Operating Income:
                               
Truckload
  $ 15,983     $ 10,854     $ 46,799     $ 23,369  
Other
    923       483       1,840       1,590  
Unallocated Corporate Overhead
    (2,277 )     (5,751 )     (5,193 )     (9,964 )
                                 
Total
  $ 14,629     $ 5,586     $ 43,446     $ 14,995