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Schedule of Investments [Parenthetical] (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Collateral amount on open futures contracts | $ 3,271,010 | $ 4,934,188
Cash Equivalents [Member] | Us Treasury Bill Securities [Member] |  |
Interest rate | 0.07% | 0.10%
Expiration date | 3/27/2014 | 1/17/2013
Open Futures Contracts - Long [Member] | ICE Brent Crude Oil Futures CO February 2014 contracts, expiring January 2014 and February 2013 contracts, expiring January 2013 [Member] |  |
Expiration date | January 2014 | January 2013

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