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Note 11 - Other Comprehensive Income ("OCI") (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about OCI
Components
  
Amount Reclassified
from
OC
I
for the
three months ended
September 30
, 2017
    
Amount Reclassified
from
OCI
for the
nine month
s ended
September 30
, 2017
  
Affected Line Item
in the Statement of
Operations
Losses
on cash flow hedges
  
 
 
 
  
 
 
 
  
Commodity derivative contracts
   $
1,003
     $
3,668
  
Fuel expense
     
(386
 )    
(1,412
 )
Income tax
benefit
    $
617
     $
2,256
  
Net of tax
                   
Interest rate swap contract
   $
98
     $
347
  
Interest expense
     
(38
 )    
(134
 )
Income tax benefit
    $
60
     $
213
  
Net of tax