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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, 2014
Sep. 30, 2013
Summary of the Effects of Commodity Derivative Instruments on the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) [Abstract]    
Increase (decrease) in fair value of derivatives included in other comprehensive income - effective portion $ (190) $ 1
Realized gain included in cost of revenues - effective portion $ 15 $ 47