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Schedule of Investments [Parenthetical] - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Collateral amount on open futures contracts | $ 14,167,416 | $ 8,297,821
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.12%, 1/04/2018 |  |
Interest rate | 1.12% |
Expiration date | 1/04/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.11%, 1/11/2018 |  |
Interest rate | 1.11% |
Expiration date | 1/11/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.10%, 1/18/2018 |  |
Interest rate | 1.10% |
Expiration date | 1/18/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.12%, 1/25/2018 |  |
Interest rate | 1.12% |
Expiration date | 1/25/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.12%, 2/01/2018 |  |
Interest rate | 1.12% |
Expiration date | 2/01/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.13%, 2/08/2018 |  |
Interest rate | 1.13% |
Expiration date | 2/08/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.12%, 2/15/2018 |  |
Interest rate | 1.12% |
Expiration date | 2/15/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.10%, 2/22/2018 |  |
Interest rate | 1.10% |
Expiration date | 2/22/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.09%, 3/01/2018 |  |
Interest rate | 1.09% |
Expiration date | 3/01/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.14%, 3/08/2018 |  |
Interest rate | 1.14% |
Expiration date | 3/08/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.14%, 3/15/2018 |  |
Interest rate | 1.14% |
Expiration date | 3/15/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.16%, 3/22/2018 |  |
Interest rate | 1.16% |
Expiration date | 3/22/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.17%, 3/29/2018 |  |
Interest rate | 1.17% |
Expiration date | 3/29/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.19%, 4/05/2018 |  |
Interest rate | 1.19% |
Expiration date | 4/05/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.22%, 4/12/2018 |  |
Interest rate | 1.22% |
Expiration date | 4/12/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.23%, 4/19/2018 |  |
Interest rate | 1.23% |
Expiration date | 4/19/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.25%, 4/26/2018 |  |
Interest rate | 1.25% |
Expiration date | 4/26/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.27%, 5/03/2018 |  |
Interest rate | 1.27% |
Expiration date | 5/03/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.32%, 5/10/2018 |  |
Interest rate | 1.32% |
Expiration date | 5/10/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.37%, 5/17/2018 |  |
Interest rate | 1.37% |
Expiration date | 5/17/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.43%, 5/24/2018 |  |
Interest rate | 1.43% |
Expiration date | 5/24/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.43%, 5/31/2018 |  |
Interest rate | 1.43% |
Expiration date | 5/31/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.45%, 6/07/2018 |  |
Interest rate | 1.45% |
Expiration date | 6/07/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.46%, 6/14/2018 |  |
Interest rate | 1.46% |
Expiration date | 6/14/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.49%, 6/21/2018 |  |
Interest rate | 1.49% |
Expiration date | 6/21/2018 |
Cash Equivalents [Member] | United States [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills,1.50%, 6/28/2018 |  |
Interest rate | 1.50% |
Expiration date | 6/28/2018 |
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.34%, 1/05/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.34%
Expiration date |  | 1/05/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.43%, 1/19/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.43%
Expiration date |  | 1/19/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.40%, 2/02/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.40%
Expiration date |  | 2/02/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.42%, 2/09/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.42%
Expiration date |  | 2/09/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.45%, 2/16/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.45%
Expiration date |  | 2/16/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.45%, 2/23/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.45%
Expiration date |  | 2/23/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.45%, 3/02/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.45%
Expiration date |  | 3/02/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.47%, 3/09/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.47%
Expiration date |  | 3/09/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.50%, 3/16/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.50%
Expiration date |  | 3/16/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.45%, 3/23/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.45%
Expiration date |  | 3/23/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.43%, 3/30/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.43%
Expiration date |  | 3/30/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.46%, 4/06/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.46%
Expiration date |  | 4/06/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.47%, 4/13/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.47%
Expiration date |  | 4/13/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.46%, 4/20/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.46%
Expiration date |  | 4/20/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.47%, 4/27/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.47%
Expiration date |  | 4/27/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.49%, 5/04/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.49%
Expiration date |  | 5/04/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.55%, 5/11/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.55%
Expiration date |  | 5/11/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.60%, 5/18/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.60%
Expiration date |  | 5/18/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.61%, 5/25/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.61%
Expiration date |  | 5/25/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.60%, 6/01/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.60%
Expiration date |  | 6/01/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.62%, 6/08/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.62%
Expiration date |  | 6/08/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.65%, 6/15/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.65%
Expiration date |  | 6/15/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.64%, 6/22/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.64%
Expiration date |  | 6/22/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.60%, 6/29/2017 | Us Treasury Securities [Member] |  |
Interest rate |  | 0.60%
Expiration date |  | 6/29/2017

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