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Note L - Off-balance Sheet Arrangements (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Rent Expense [Table Text Block]
   
Three Months Ended
 
   
March 31,
 
   
2017
   
2016
 
   
(in thousands)
 
                 
Rent expense related to revenue equipment
  $
1,741
    $
2,544
 
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
(in thousands)
 
2017
  $
3,591
 
2018
   
181
 
Total future minimum lease payments
  $
3,772