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Note 5 - Derivative Financial Instruments (Details) - Summary of the effects of commodity derivative instruments on the condensed consolidated statements of operations and comprehensive income (loss): (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Summary of the effects of commodity derivative instruments on the condensed consolidated statements of operations and comprehensive income (loss): [Abstract]    
Increase in fair value of derivatives included in other comprehensive income (loss) - effective portion $ 1 $ 272
Realized gain (loss) included in cost of revenues - effective portion $ 47 $ (57)