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Note 11 - Other Comprehensive Income (Loss) ("OCI") (Tables)
 6 Months Ended
Jun. 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
June 30, 201
8
    
Amount
Reclassified from
OCI
for the six
months ended
June 30, 201
8
  
Affected Line Item
in the Statement of
Operations
Losses
on cash flow hedges
  
 
 
 
  
 
 
 
  
Commodity derivative contracts
    
$(533)
      
$(732)
  
Fuel expense
     
146
      
201
  
Income tax benefit
     
$(387)
      
$(531)
  
Net of tax
                   
Interest rate swap contract
    
$33
      
$96
  
Interest expense
     
(9)
      
(26)
  
Income tax benefit
     
$24
      
$70
  
Net of tax