Fair Value Of Financial Instruments (Effect of Derivative Instruments on Condensed Statements of Operations) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	$ 2,395,300	$ (12,161,650)	$ (7,653,100)
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	1,996,630	7,676,740	(6,408,260)
Futures [Member] | Change inunrealized gain (loss) on open positions
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	1,996,630	7,676,740	(6,408,260)
Commodity Contracts [Member] | Futures [Member] | Realized gain (loss) on closed positions
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	$ 2,395,300	$ (12,161,650)	$ (7,653,100)