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Note 3 - Derivative Instruments (Details) - Carrying Value of Derivative Instruments (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Commodity Option [Member]
   
Derivative [Line Items]    
Quantity (Contracts) Long/(Short) (400) (50)
Fair Value (in Dollars) $ (703) $ (328)
Future [Member]
   
Derivative [Line Items]    
Quantity (Contracts) Long/(Short) 42 4
Fair Value (in Dollars) $ (30)