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Fair Value of Financial Instruments (Valuation of Securities Using Fair Value Hierarchy) (Details) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
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Short-Term Investments
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities, fair value | $ 59,154,742 | $ 92,755,785 |
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Exchange-Traded Futures Contracts | United States
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities, fair value | 1,642,450 | 1,556,910 |
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Fair Value, Inputs, Level 1 | Short-Term Investments
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities, fair value | 59,154,742 | 92,755,785 |
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Fair Value, Inputs, Level 1 | Exchange-Traded Futures Contracts | United States
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities, fair value | $ 1,642,450 | $ 1,556,910 |