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Fair Value Of Financial Instruments (Details 2) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Derivatives not Accounted for as Hedging Instruments Futures - Commodity Contracts  
Location of Gain or (Loss) on Derivatives Recognized in Income Change in unrealized loss on open positions  
Realized Gain or (Loss) on Derivatives Recognized in Income $ (4,181,120) $ 3,812,980
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income $ (3,035,200) $ (2,378,680)
Commodity Contract [Member]
    
Location of Gain or (Loss) on Derivatives Recognized in Income Realized gain (loss) on closed positions