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Note 3 - Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
   
Asset/ (Liability)
 
 
 
   
March 31, 2017
   
December 31, 2016
 
   
Quantity (contracts) Long/(Short)
   
Fair Value
   
Quantity (contracts) Long/(Short)
     
Fair
Value
 
Regulated options, included in other current assets
   
(200
)   $
(1,462
)    
-
      $
-
 
Regulated fixed price future commitments, included in other current assets
   
23
    $
2
     
(135
)     $
(258
)