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Note 7 - Debt (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Debt [Table Text Block]
(in thousands)
 
March 31, 2016
   
December
31, 2015
 
   
Current
   
Long-Term
   
Current
   
Long-Term
 
Borrowings under Credit Facility
  $ -     $ 9,713     $ -     $ 3,002  
Revenue equipment installment; weighted average interest rate of 3.5% and 3.6% at March 31, 2016 and December 31, 2015, respectively, due in monthly installments with final maturities at various dates ranging from April 2016 to January 2022, secured by related revenue equipment
    26,109       107,760       38,461       163,387  
Real estate notes; interest rate of 2.2% and 2.5% at March 31, 2016 and December 31, 2015, due in monthly installments with fixed maturities at December 2018 and August 2035, secured by related real estate
    1,194       29,829       1,184       30,124  
Deferred loan costs     (247 )     (438 )     (250 )     (456 )
Total debt
    27,056       146,864       39,395       196,057  
Principal portion of capital lease obligations, secured by related revenue equipment
    3,917       10,224       4,031       10,547  
Total debt and capital lease obligations
  $ 30,973     $ 157,088     $ 43,426     $ 206,604