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Fair Value Of Financial Instruments (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivatives not Accounted for as Hedging Instruments Futures - Commodity Contracts    
Location of Gain or (Loss) on Derivatives Recognized in Income Change in unrealized gain (loss) on open positions    
Realized Gain or (Loss) on Derivatives Recognized in Income $ 3,338,310 $ 3,239,910 $ 8,052,950
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income $ (710,660) $ 1,655,900 $ (1,239,230)
Commodity Contract [Member]
      
Location of Gain or (Loss) on Derivatives Recognized in Income Realized gain (loss) on closed positions