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Note 6 - Derivative Instruments and Fair Value Measurements (Detail) - Commodity Derivatives Not Designated as Hedge Derivatives (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Commodity derivatives $ 361 $ (2,450) $ (466) $ 2,696