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Note 5 - Debt and Lease Obligations (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Debt [Table Text Block]
(in thousands)
  
September 30, 2019
    
December 31, 2018
  
   
Current
    
Long-Term
    
Current
    
Long-Term
  
Borrowings under Credit Facility
   $
-
     $
13,724
     $
-
     $
3,911
  
Revenue equipment installment notes; weighted average interest rate of 3.8% at September 30, 2019, and 3.7% at December 31, 2018, due in monthly installments with final maturities at various dates ranging from October 2019 to July 2023, secured by related revenue equipment
    
46,876
      
193,089
      
27,809
      
139,115
  
                                 
Real estate notes; interest rate of 3.8% at September 30, 2019 and 4.1% at December 31, 2018 due in monthly installments with a fixed maturity at August 2035, secured by related real estate
    
1,081
      
22,947
      
1,048
      
23,763
  
Deferred loan costs
    
(147
 )    
(44
 )    
(147
 )    
(154
 )
Total debt
    
47,810
      
229,716
      
28,710
      
166,635
  
Principal portion of finance lease obligations, secured by related revenue equipment
    
7,164
      
29,097
      
5,374
      
35,119
  
Principal portion of operating lease obligations, secured by related revenue equipment
    
17,875
      
36,916
      
-
      
-
  
Total debt and lease obligations
   $
72,849
     $
295,729
     $
34,084
     $
201,754