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Schedule of Investments [Parenthetical] (USD $)	12 Months Ended
Schedule of Investments [Parenthetical] (USD $)	Dec. 31, 2014	Dec. 31, 2013
Collateral amount on open futures contracts	9,152,751	3,271,010
Cash Equivalents [Member] \| U S Treasury Bills 0.05%, 01/15/15 [Member]
Interest rate	0.05%
Expiration date	2015-01-15
Cash Equivalents [Member] \| U S Treasury Bills 0.05%, 02/26/15 [Member]
Interest rate	0.05%
Expiration date	2015-02-26
Cash Equivalents [Member] \| U S Treasury Bills 0.05%, 04/23/15 [Member]
Interest rate	0.05%
Expiration date	2015-04-23
Cash Equivalents [Member] \| U S Treasury Bills 0.07%, 05/21/15 [Member]
Interest rate	0.07%
Expiration date	2015-05-21
Cash Equivalents [Member] \| U S Treasury Bills 0.10%, 06/25/15 [Member]
Interest rate	0.10%
Expiration date	2015-06-25
Cash Equivalents [Member] \| U.S. Treasury Bill, 0.07%, 3/27/2014 [Member]
Interest rate		0.07%
Expiration date		2014-03-27
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 2015	January 2014