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Note 5 - Debt (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Debt [Table Text Block]
(in thousands)
  
March 31, 2019
    
December 31, 2018
  
   
Current
    
Long-Term
    
Current
    
Long-Term
  
Borrowings under Credit Facility
   $
-
     $
29,626
     $
-
     $
3,911
  
Revenue equipment installment notes; weighted average interest rate of 3.8% at March 31, 2019, and 3.7% at December 31, 2018, due in monthly installments with final maturities at various dates ranging from April 2019 to July 2023, secured by related revenue equipment
    
30,880
      
145,049
      
27,809
      
139,115
  
 
                                
Real estate notes; interest rate of 4.2% at March 31, 2019 and 4.1% at December 31, 2018 due in monthly installments with a fixed maturity at August 2035, secured by related real estate    
1,059
      
23,494
      
1,048
      
23,763
  
Deferred loan costs
    
(147
 )    
(117
 )    
(147
 )    
(154
 )
Total debt
    
31,792
      
198,052
      
28,710
      
166,635
  
Principal portion of finance lease obligations, secured by related revenue equipment
    
6,898
      
32,223
      
5,374
      
35,119
  
Principal portion of operating lease obligations, secured by related revenue equipment
    
2,300
      
38,700
      
-
      
-
  
Total debt and lease obligations   $
40,990
     $
268,975
     $
34,084
     $
201,754