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Condensed Schedule of Investments [Parenthetical] (USD $) | 9 Months Ended
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Sep. 30, 2013
Collateral amount on open futures contracts | $ 3,989,981
Cash Equivalents [Member] | Us Treasury Bill Securities [Member] |
Interest rate | 0.06%
Expiration date | 11/21/2013
Open Futures Contracts - Long [Member] | ICE Brent Crude Oil Futures CO November 2013 contracts, expiring October 2013 |
Expiration date | October 2013

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