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Note 7 - Debt (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Debt [Table Text Block]
(in thousands)
 
September 30, 2016
   
December
31, 2015
 
   
Current
   
Long-Term
   
Current
   
Long-Term
 
Borrowings under Credit Facility
  $ -     $ 15,836     $ -     $ 3,002  
Revenue equipment installment notes with finance companies; weighted average interest rate of 3.4% and 3.6% at September 30, 2016 and December 31, 2015, respectively, due in monthly installments with final maturities at various dates ranging from October 2016 to January 2022, secured by related revenue equipment
    28,605       133,462       38,461       163,387  
Real estate notes; weighted average interest rate of 2.3% and 2.5% at September 30, 2016 and December 31, 2015, respectively due in monthly installments with fixed maturities at December 2018 and August 2035, secured by related real estate
    1,214       29,217       1,184       30,124  
Deferred loan costs
    (264 )     (327 )     (250 )     (456 )
Total debt
    29,555       178,188       39,395       196,057  
Principal portion of capital lease obligations, secured by related revenue equipment
  $ 1,736     $ 13,693     $ 4,031     $ 10,547  
Total debt and capital lease obligations
  $ 31,291     $ 191,881     $ 43,426     $ 206,604