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Note 1 - Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
   
Three Months Ended March 31, 2018
 
Financial Statement Line Item (in thousands)
 
As reported
   
Adjustments
   
Balances without
adoption of Topic
606
 
Consolidated
Balance S
heet
 
Accounts receivable, net of allowances
  $
94,793
    $
(1,291
)   $
93,502
 
Total assets
   
655,333
     
(1,291
)    
654,042
 
Accrued expenses
   
22,768
     
(199
)    
22,569
 
Deferred income taxes
   
65,539
     
(300
)    
65,239
 
Total liabilities
   
353,645
     
(499
)    
353,146
 
Retained earnings
   
162,479
     
(792
)    
161,687
 
Total stockholders’ equity
   
301,688
     
(792
)    
300,896
 
Total liabilities and stockholders’ equity
   
655,333
     
(1,291
)    
654,042
 
Consolidated
Statement of Operations
 
Freight revenue
   
150,463
     
(281
)    
150,182
 
Total revenue
   
173,566
     
(281
)    
173,285
 
Salaries, wages and related expenses
   
60,619
     
15
     
60,634
 
Revenue equipment rentals and purchased transportation
   
30,691
     
(19
)    
30,672
 
Total operating expenses
   
167,141
     
(4
)    
167,137
 
Income tax expense
   
1,538
     
(76
)    
1,462
 
Net income
   
4,417
     
(201
)    
4,216
 
Consolidated Statement of Comprehensive Income
 
Net income
   
4,417
     
(201
)    
4,216
 
Comprehensive income
   
5,088
     
(201
)    
4,887
 
Consolidated Statement of Cash Flows
 
Operating Cash Flows
                       
Net income
   
4,417
     
(201
)    
4,216
 
Deferred income tax expense
   
1,691
     
(76
)    
1,615
 
Change in: Receivables and advances
   
12,995
     
281
     
13,276
 
Change in: Accounts payable and accrued expenses
   
(4,246
)    
(4
)    
(4,250
)
Net cash flows provided by operating activities
   
36,696
     
-
     
36,696
 
Disaggregation of Revenue [Table Text Block]
(in thousands)
 
Three months ended
March 31,
 
   
2018
   
2017
 
Total Revenues:
               
Truckload: Covenant Transport
  $
95,713
    $
87,842
 
Truckload: SRT
   
40,703
     
40,700
 
Truckload: Star Transportation
   
18,132
     
17,083
 
Managed Freight
   
19,018
     
13,119
 
                 
Total
  $
173,566
    $
158,744