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Note 14 - Other Comprehensive Income ("OCI") (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about
OCI
Components
  
Amoun
t Reclassified from
OCI for the years ended
December 31,
  
Affected Line Item in the Statement of Operations
   
201
7
    
2016
    
2015
    
(Losses) gains on cash flow hedges
  
 
 
 
  
 
 
 
  
 
 
 
  
Commodity derivative contracts
   $
(4,065
 )   $
(16,674
 )   $
(15,313
 )
Fuel expense
     
1,554
      
6,419
      
5,865
  
Income tax expense
    $
(2,511
 )   $
(10,255
 )   $
(9,448
 )
Net of tax
Interest rate swap contracts
   $
(438
 )   $
(557
 )   $
(259
 )
Interest expense
     
165
      
215
      
99
  
Income tax expense
    $
(273
 )   $
(342
 )   $
(160
 )
Net of tax