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Note 11 - Accumulated Other Comprehensive Income (Tables)
3 Months Ended
Mar. 31, 2013
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Details about AOCI Components
 
Amount Reclassified from AOCI
  Affected Line Item in the Statement of Operations
Gains/(losses) on cash flow hedges
       
Commodity derivative contracts
  $ 280  
Fuel expense
      (108 )
Income tax expense
    $ 172  
Net of tax