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Fair Value of Financial Instruments (Effect of Derivative Instruments on Condensed Statements of Operations) (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Realized Gain or (Loss) on Derivatives Recognized in Income | $ 6,302,760 | $ (6,954,520) | $ 16,224,040 |
| Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income | 85,540 | (2,445,210) | (11,864,440) |
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Commodity Contracts | Futures | Realized gain on closed positions
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| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 6,302,760 | (6,954,520) | 16,224,040 |
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Commodity Contracts | Futures | Change in unrealized gain (loss) on open positions
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| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income | $ 85,540 | $ (2,445,210) | $ (11,864,440) |