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Note 7 - Debt (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Debt [Table Text Block]
(in thousands)
 
September 30, 2018
   
December 31, 2017
 
   
Current
   
Long-Term
   
Current
   
Long-Term
 
Borrowings under Credit Facility; interest rate of 5.8% at September 30, 2018
  $
-
    $
6,155
    $
-
    $
-
 
Revenue equipment installment notes with finance companies; weighted average interest rate of 3.6% and 3.3% at September 30, 2018 and December 31, 2017, respectively, due in monthly installments with final maturities at various dates ranging from October 2018 to July 2023, secured by related revenue equipment
   
26,752
     
139,044
     
23,732
     
130,946
 
Real estate note; interest rate of 3.8% and 3.1% at September 30, 2018 and December 31, 2017, respectively, due in monthly installments with a fixed maturity at August 2035, secured by related real estate
   
1,037
     
24,029
     
1,004
     
24,810
 
Deferred loan costs
   
(146
)    
(191
)    
(140
)    
(298
)
Total debt
   
27,643
     
169,037
     
24,596
     
164,465
 
Principal portion of capital lease obligations, secured by related revenue equipment
   
5,074
     
33,877
     
2,962
     
21,777
 
Total debt and capital lease obligations
  $
32,717
    $
202,914
    $
27,558
    $
186,242