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Note 11 - Other Comprehensive Income (Loss) ("OCI") (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about
OCI
Components
  
Amount Reclassified
from
OCI
for the
three months ended
September
30, 201
8
    
Amount
Reclassified from
OCI
for the
nine
months ended
September
30,
201
8
  
Affected Line Item
in the Statement of
Operations
Losses
(gains)
on cash
flow hedges
  
 
 
 
  
 
 
 
  
Commodity derivative contracts
   $
(580
 )   $
(1,312
 )
Fuel expense
     
160
      
361
  
Income tax expense
    $
(420
 )   $
(951
 )
Net of tax
                   
Interest rate swap contract
   $
19
     $
114
  
Interest expense
     
(5
 )    
(31
 )
Income tax benefit
    $
14
     $
83
  
Net of tax