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Note 11 - Business Segments (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months
 
   
Ended March 31,
  
(
Dollars in thousands
)
  
2017
    
2016
  
Operating revenue:
                
Truckload revenue, net of fuel surcharge revenue
   $
84,811
     $
82,942
  
Truckload fuel surcharge revenue
    
10,847
      
7,112
  
Total Truckload revenue
    
95,658
      
90,054
  
                 
Dedicated revenue, net of fuel surcharge revenue
    
36,899
      
35,510
  
Dedicated fuel surcharge revenue
    
3,378
      
1,587
  
Total Dedicated revenue
    
40,277
      
37,097
  
                 
Intermodal revenue, net of fuel surcharge revenue
    
16,811
      
15,854
  
Intermodal fuel surcharge revenue
    
2,375
      
1,347
  
Total Intermodal revenue
    
19,186
      
17,201
  
                 
Brokerage revenue
    
18,038
      
17,577
  
Total operating revenue
   $
173,159
     $
161,929
  
                 
Operating income:
                
Truckload
   $
5,974
     $
6,940
  
Dedicated
    
4,487
      
4,324
  
Intermodal
    
2,149
      
1,929
  
Brokerage
    
1,328
      
932
  
Total operating income
   $
13,938
    $
14,125