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Note 12 - Other Comprehensive Income ("OCI") (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Amount Reclassified from OCI for the years ended
 
 
Details about OCI Components
  
December 31,
  
Affected Line Item in the Statement of Operations
   
2018
    
2017
    
2016
  
 
Gains (losses) on cash flow hedges
 
 
 
 
  
 
 
 
  
 
 
 
  
Commodity derivative contracts
   $
1,600
     $
(4,065
 )   $
(16,674
 )
Fuel expense
     
(440
 )    
1,554
      
6,419
  
Income tax expense
    $
1,160
     $
(2,511
 )   $
(10,255
 )
Net of tax
Interest rate swap contracts
   $
(115
 )   $
(438
 )   $
(557
 )
Interest expense
     
32
      
165
      
215
  
Income tax expense
    $
(83
 )   $
(273
 )   $
(342
 )
Net of tax