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Note 14 - Accumulated Other Comprehensive (Loss) Income (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about AOCI
Components
 
Amount Reclassified from AOCI for the years ended December 31,
 
Affected Line
Item in the
Statement of
Operations
   
2015
    
2014
    
2013
    
(Losses) gains on cash flow hedges
 
 
 
 
 
 
 
 
 
 
 
 
 
Commodity derivative contracts
   $ (15,313 )   $ (3,141 )   $ 643  
Fuel expense
      5,865       1,206       (247 )
Income tax expense
    $ (9,448 )   $ (1,935 )   $ 396  
Net of tax
Interest rate swap contract
   $ (259 )   $ -     $ -  
Interest expense
      99       -       -  
Income tax expense
    $ (160 )   $ -     $ -  
Net of tax