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Note L - Off-balance Sheet Arrangements (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Rent Expense [Table Text Block]
   
Three Months Ended
   
Nine
Months Ended
 
   
September
30,
   
September
30,
 
   
2017
   
2016
   
2017
   
2016
 
   
(in thousands
)
 
Rent expense related to revenue equipment
  $
1,502
    $
2,332
    $
4,960
    $
7,401
 
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
(in thousands)
 
201
7
  $
316
 
201
8
   
177
 
Total
future minimum lease payments
  $
493