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Note 11 - Other Comprehensive Income ("OCI") (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about
OC
I
Components
  
Amount Reclassified
from OC
I
for the
three months ended
March 31, 201
8
  
Affected Line Item
in the Statement of
Operations
Losses
on cash flow hedges
  
 
 
 
  
Commodity derivative contracts
   $
(199
 )
Fuel benefit
     
55
  
Income tax expense
    $
(144
 )
Net of tax
           
Interest rate swap contracts
   $
62
  
Interest expense
     
(17
 )
Income tax benefit
    $
45
  
Net of tax