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Note 3 - Segment Information (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
(in thousands)
 
Three months ended
September 30,
   
Nine months ended
September 30,
 
   
2016
   
2015
   
2016
   
2015
 
Total Revenues:
                               
Truckload
  $ 148,603     $ 159,615     $ 436,055     $ 479,664  
Other
    15,897       13,897       43,618       36,514  
                                 
Total
  $ 164,500     $ 173,512     $ 479,673     $ 516,178  
                                 
Operating Income:
                               
Truckload
  $ 5,508     $ 15,983     $ 22,558     $ 46,799  
Other
    1,829       923       5,144       1,840  
Unallocated Corporate Overhead
    (1,891 )     (2,277 )     (7,521 )     (5,193 )
                                 
Total
  $ 5,446     $ 14,629     $ 20,181     $ 43,446