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Note 4 - Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
Operating revenue
  
201
8
    
2017
    
201
8
    
2017
  
Trucking revenue (1)
  
$
85,685
     $
71,731
    
$
164,531
     $
142,202
  
Trucking intersegment eliminations
  
 
(116
)
    
(186
 )  
 
(229
)
    
(377
 )
Trucking operating revenue
  
 
85,569
      
71,545
    
 
164,302
      
141,825
  
USAT Logistics revenue
  
 
50,616
      
36,878
    
 
97,391
      
69,528
  
USAT Logistics intersegment eliminations
  
 
(804
)
    
(1,065
 )  
 
(1,299
)
    
(2,325
 )
USAT Logistics operating revenue
  
 
49,812
      
35,813
    
 
96,092
      
67,203
  
Total operating revenue
  
$
135,381
     $
107,358
    
$
260,394
     $
209,028
  
   
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
Operating
income
(loss)
  
201
8
    
2017
    
201
8
    
2017
  
Trucking
  
$
2,153
     $
(4,843
 )  
$
1,689
     $
(11,971
 )
USAT Logistics
  
 
2,158
      
1,877
    
 
5,014
      
2,606
  
Total operating income (loss)
  
$
4,311
     $
(2,966
 )  
$
6,703
     $
(9,365
 )
   
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
Depreciation and amortization
  
201
8
    
2017
    
201
8
    
2017
  
Trucking
  
$
7,299
     $
6,759
    
$
14,325
     $
14,323
  
USAT Logistics
  
 
178
      
120
    
 
332
      
200
  
Total depreciation and amortization
  
$
7,477
     $
6,879
    
$
14,657
     $
14,523