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Note 11 - Business Segments (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months
   
Six Months
 
   
Ended June 30,
   
Ended June 30,
 
(
Dollars in thousands
)
 
2016
   
2015
   
2016
   
2015
 
Operating revenue:
                               
Truckload revenue, net of fuel surcharge revenue
  $ 85,103     $ 88,822     $ 168,045     $ 175,633  
Truckload fuel surcharge revenue
    8,933       13,929       16,045       28,519  
Total Truckload revenue
    94,036       102,751       184,090       204,152  
                                 
Dedicated revenue, net of fuel surcharge revenue
    36,654       22,601       72,164       42,464  
Dedicated fuel surcharge revenue
    2,621       2,803       4,208       5,394  
Total Dedicated revenue
    39,275       25,404       76,372       47,858  
                                 
Intermodal revenue, net of fuel surcharge revenue
    16,118       16,101       31,972       33,120  
Intermodal fuel surcharge revenue
    1,664       2,945       3,011       6,318  
Total Intermodal revenue
    17,782       19,046       34,983       39,438  
                                 
Brokerage revenue
    14,997       16,387       32,574       33,427  
                                 
Total operating revenue
  $ 166,090     $ 163,588     $ 328,019     $ 324,875  
                                 
Operating income:
                               
Truckload
  $ 6,951     $ 9,808     $ 13,891     $ 19,410  
Dedicated
    5,134       2,563       9,458       4,567  
Intermodal
    1,822       969       3,751       2,220  
Brokerage
    869       821       1,801       1,563  
Total operating income before gain on
disposition of facility
    14,776       14,161       28,901       27,760  
Gain on disposition of facility
    -       -       -       3,712  
Total operating income
  $ 14,776     $ 14,161     $ 28,901     $ 31,472