Schedule of Investments (Parenthetical) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Collateral Amount On Open Futures Contracts	$ 29,320,958	$ 19,785,491
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.13%, 1/21/2016
Interest rate	0.13%
Expiration date	1/21/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.15%, 1/28/2016
Interest rate	0.15%
Expiration date	1/28/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.19%, 2/04/2016
Interest rate	0.19%
Expiration date	2/04/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.22%, 2/11/2016
Interest rate	0.22%
Expiration date	2/11/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.20%, 2/18/2016
Interest rate	0.20%
Expiration date	2/18/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.20%, 2/25/2016
Interest rate	0.20%
Expiration date	2/25/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.23%, 3/03/2016
Interest rate	0.23%
Expiration date	3/03/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.26%, 3/10/2016
Interest rate	0.26%
Expiration date	3/10/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.24%, 3/17/2016
Interest rate	0.24%
Expiration date	3/17/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.09%, 3/24/2016
Interest rate	0.09%
Expiration date	3/24/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.07%, 3/31/2016
Interest rate	0.07%
Expiration date	3/31/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.07%, 4/07/2016
Interest rate	0.07%
Expiration date	4/07/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.07%, 4/14/2016
Interest rate	0.07%
Expiration date	4/14/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.11%, 4/21/2016
Interest rate	0.11%
Expiration date	4/21/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.21%, 4/28/2016
Interest rate	0.21%
Expiration date	4/28/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.26%, 5/05/2016
Interest rate	0.26%
Expiration date	5/05/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.33%, 5/12/2016
Interest rate	0.33%
Expiration date	5/12/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.31%, 5/19/2016
Interest rate	0.31%
Expiration date	5/19/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.35%, 5/26/2016
Interest rate	0.35%
Expiration date	5/26/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.43%, 6/02/2016
Interest rate	0.43%
Expiration date	6/02/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.52%, 6/09/2016
Interest rate	0.52%
Expiration date	6/09/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.48%, 6/16/2016
Interest rate	0.48%
Expiration date	6/16/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.46%, 6/23/2016
Interest rate	0.46%
Expiration date	6/23/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.47%, 6/30/2016
Interest rate	0.47%
Expiration date	6/30/2016
U.S. Treasury Bill, 0.05%, 1/15/2015 \| US Treasury Securities \| Cash Equivalents
Interest rate		0.05%
Expiration date		1/15/2015
U.S. Treasury Bill 0.10%, 6/25/2015 \| US Treasury Securities \| Cash Equivalents
Interest rate		0.10%
Expiration date		6/25/2015
United States \| NYMEX WTI Crude Oil Futures CL February 2015 contracts, expiring January 2015 \| Open Futures Contracts, Long
Expiration date		January 2015
United States \| NYMEX WTI Crude Oil Futures CL March 2015 contracts, expiring February 2015 \| Open Futures Contracts, Long
Expiration date		February 2015
United States \| NYMEX WTI Crude Oil Futures CL April 2015 contracts, expiring March 2015 \| Open Futures Contracts, Long
Expiration date		March 2015
United States \| NYMEX WTI Crude Oil Futures CL May 2015 contracts, expiring April 2015 \| Open Futures Contracts, Long
Expiration date		April 2015
United States \| NYMEX WTI Crude Oil Futures CL June 2015 contracts, expiring May 2015 \| Open Futures Contracts, Long
Expiration date		May 2015
United States \| NYMEX WTI Crude Oil Futures CL July 2015 contracts, expiring June 2015 \| Open Futures Contracts, Long
Expiration date		June 2015
United States \| NYMEX WTI Crude Oil Futures CL August 2015 contracts, expiring July 2015 \| Open Futures Contracts, Long
Expiration date		July 2015
United States \| NYMEX WTI Crude Oil Futures CL September 2015 contracts, expiring August 2015 \| Open Futures Contracts, Long
Expiration date		August 2015
United States \| NYMEX WTI Crude Oil Futures CL October 2015 contracts, expiring September 2015 \| Open Futures Contracts, Long
Expiration date		September 2015
United States \| NYMEX WTI Crude Oil Futures CL November 2015 contracts, expiring October 2015 \| Open Futures Contracts, Long
Expiration date		October 2015
United States \| NYMEX WTI Crude Oil Futures CL December 2015 contracts, expiring November 2015 \| Open Futures Contracts, Long
Expiration date		November 2015
United States \| NYMEX WTI Crude Oil Futures CL January 2016 contracts, expiring December 2015 \| Open Futures Contracts, Long
Expiration date		December 2015
United States \| NYMEX WTI Crude Oil Futures CL February 2016 contracts, expiring January 2016 \| Open Futures Contracts, Long
Expiration date	January 2016
United States \| NYMEX WTI Crude Oil Futures CL March 2016 contracts, expiring February 2016 \| Open Futures Contracts, Long
Expiration date	February 2016
United States \| NYMEX WTI Crude Oil Futures CL April 2016 contracts, expiring March 2016 \| Open Futures Contracts, Long
Expiration date	March 2016
United States \| NYMEX WTI Crude Oil Futures CL May 2016 contracts, expiring April 2016 \| Open Futures Contracts, Long
Expiration date	April 2016
United States \| NYMEX WTI Crude Oil Futures CL June 2016 contracts, expiring May 2016 \| Open Futures Contracts, Long
Expiration date	May 2016
United States \| NYMEX WTI Crude Oil Futures CL July 2016 contracts, expiring June 2016 \| Open Futures Contracts, Long
Expiration date	June 2016
United States \| NYMEX WTI Crude Oil Futures CL August 2016 contracts, expiring July 2016 \| Open Futures Contracts, Long
Expiration date	July 2016
United States \| NYMEX WTI Crude Oil Futures CL September 2016 contracts, expiring August 2016 \| Open Futures Contracts, Long
Expiration date	August 2016
United States \| NYMEX WTI Crude Oil Futures CL October 2016 contracts, expiring September 2016 \| Open Futures Contracts, Long
Expiration date	September 2016
United States \| NYMEX WTI Crude Oil Futures CL November 2016 contracts, expiring October 2016 \| Open Futures Contracts, Long
Expiration date	October 2016
United States \| NYMEX WTI Crude Oil Futures CL December 2016 contracts, expiring November 2016 \| Open Futures Contracts, Long
Expiration date	November 2016
United States \| NYMEX WTI Crude Oil Futures CL January 2017 contracts, expiring December 2016 \| Open Futures Contracts, Long
Expiration date	December 2016