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Condensed Schedule of Investments [Parenthetical] | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($)
Collateral amount on open futures contracts | $ 14,769,562
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.87%, 10/04/2018 |
Interest rate | 1.87%
Expiration date | 10/04/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.90%, 10/11/2018 |
Interest rate | 1.90%
Expiration date | 10/11/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.97%, 10/18/2018 |
Interest rate | 1.97%
Expiration date | 10/18/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.00%, 10/25/2018 |
Interest rate | 2.00%
Expiration date | 10/25/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.00%, 11/01/2018 |
Interest rate | 2.00%
Expiration date | 11/01/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.03%, 11/08/2018 |
Interest rate | 2.03%
Expiration date | 11/08/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.05%, 11/15/2018 |
Interest rate | 2.05%
Expiration date | 11/15/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.07%, 11/23/2018 |
Interest rate | 2.07%
Expiration date | 11/23/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.05%, 11/29/2018 |
Interest rate | 2.05%
Expiration date | 11/29/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.09%, 12/06/2018 |
Interest rate | 2.09%
Expiration date | 12/06/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.06%, 12/13/2018 |
Interest rate | 2.06%
Expiration date | 12/13/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.09%, 12/20/2018 |
Interest rate | 2.09%
Expiration date | 12/20/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.07%, 12/27/2018 |
Interest rate | 2.07%
Expiration date | 12/27/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.10%, 1/03/2019 |
Interest rate | 2.10%
Expiration date | 1/03/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.10%, 1/10/2019 |
Interest rate | 2.10%
Expiration date | 1/10/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.13%, 1/17/2019 |
Interest rate | 2.13%
Expiration date | 1/17/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.15%, 1/24/2019 |
Interest rate | 2.15%
Expiration date | 1/24/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.18%, 1/31/2019 |
Interest rate | 2.18%
Expiration date | 1/31/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.20%, 2/07/2019 |
Interest rate | 2.20%
Expiration date | 2/07/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.19%, 2/14/2019 |
Interest rate | 2.19%
Expiration date | 2/14/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.20%, 2/21/2019 |
Interest rate | 2.20%
Expiration date | 2/21/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.24%, 2/28/2019 |
Interest rate | 2.24%
Expiration date | 2/28/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.38%, 3/07/2019 |
Interest rate | 2.38%
Expiration date | 3/07/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.28%, 3/14/2019 |
Interest rate | 2.28%
Expiration date | 3/14/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.33%, 3/21/2019 |
Interest rate | 2.33%
Expiration date | 3/21/2019
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.34%, 3/28/2019 |
Interest rate | 2.34%
Expiration date | 3/28/2019

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