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Note 14 - Other Comprehensive Income ("OCI") (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about OCI
Components
 
Amount Reclassified from OCI for the years ended
December 31,
 
Affected Line Item in
the Statement of
Operations
   
2016
    
2015
    
2014
    
(Losses) gains on cash flow hedges
 
 
 
 
 
 
 
 
 
 
 
 
 
Commodity derivative contracts
   $
(16,674
 )   $
(15,313
 )   $
(3,141
 )
Fuel expense
     
6,419
      
5,865
      
1,206
  
Income tax expense
    $
(10,255
 )   $
(9,448
 )   $
(1,935
 )
Net of tax
                           
Interest rate swap contracts
   $
(557
 )   $
(259
 )   $
-
  
Interest expense
     
215
      
99
      
-
  
Income tax expense
    $
(342
 )   $
(160
 )   $
-
  
Net of tax