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v3.19.1

Schedule of Investments [Parenthetical] - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Collateral amount on open futures contracts | $ 17,417,768 | $ 14,167,416
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.10%, 1/03/2019 |  |
Interest rate | 2.10% |
Expiration date | 1/03/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.10%, 1/10/2019 |  |
Interest rate | 2.10% |
Expiration date | 1/10/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.13%, 1/17/2019 |  |
Interest rate | 2.13% |
Expiration date | 1/17/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.15%, 1/24/2019 |  |
Interest rate | 2.15% |
Expiration date | 1/24/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.18%, 1/31/2019 |  |
Interest rate | 2.18% |
Expiration date | 1/31/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.20%, 2/07/2019 |  |
Interest rate | 2.20% |
Expiration date | 2/07/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.19%, 2/14/2019 |  |
Interest rate | 2.19% |
Expiration date | 2/14/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.20%, 2/21/2019 |  |
Interest rate | 2.20% |
Expiration date | 2/21/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.24%, 2/28/2019 |  |
Interest rate | 2.24% |
Expiration date | 2/28/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.38%, 3/07/2019 |  |
Interest rate | 2.38% |
Expiration date | 3/07/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.28%, 3/14/2019 |  |
Interest rate | 2.28% |
Expiration date | 3/14/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.33%, 3/21/2019 |  |
Interest rate | 2.33% |
Expiration date | 3/21/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.34%, 3/28/2019 |  |
Interest rate | 2.34% |
Expiration date | 3/28/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.37%, 4/04/2019 |  |
Interest rate | 2.37% |
Expiration date | 4/04/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.41%, 4/11/2019 |  |
Interest rate | 2.41% |
Expiration date | 4/11/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.42%, 4/18/2019 |  |
Interest rate | 2.42% |
Expiration date | 4/18/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.43%, 4/25/2019 |  |
Interest rate | 2.43% |
Expiration date | 4/25/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.46%, 5/02/2019 |  |
Interest rate | 2.46% |
Expiration date | 5/02/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.47%, 5/09/2019 |  |
Interest rate | 2.47% |
Expiration date | 5/09/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.48%, 5/16/2019 |  |
Interest rate | 2.48% |
Expiration date | 5/16/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.50%, 5/23/2019 |  |
Interest rate | 2.50% |
Expiration date | 5/23/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.49%, 5/30/2019 |  |
Interest rate | 2.49% |
Expiration date | 5/30/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.51%, 6/06/2019 |  |
Interest rate | 2.51% |
Expiration date | 6/06/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.51%, 6/13/2019 |  |
Interest rate | 2.51% |
Expiration date | 6/13/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.49%, 6/20/2019 |  |
Interest rate | 2.49% |
Expiration date | 6/20/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.49%, 6/27/2019 |  |
Interest rate | 2.49% |
Expiration date | 6/27/2019 |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.12%, 1/04/2018 |  |
Interest rate |  | 1.12%
Expiration date |  | 1/04/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.11%, 1/11/2018 |  |
Interest rate |  | 1.11%
Expiration date |  | 1/11/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.10%, 1/18/2018 |  |
Interest rate |  | 1.10%
Expiration date |  | 1/18/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.12%, 1/25/2018 |  |
Interest rate |  | 1.12%
Expiration date |  | 1/25/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.12%, 2/01/2018 |  |
Interest rate |  | 1.12%
Expiration date |  | 2/01/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.13%, 2/08/2018 |  |
Interest rate |  | 1.13%
Expiration date |  | 2/08/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.12%, 2/15/2018 |  |
Interest rate |  | 1.12%
Expiration date |  | 2/15/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.10%, 2/22/2018 |  |
Interest rate |  | 1.10%
Expiration date |  | 2/22/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.09%, 3/01/2018 |  |
Interest rate |  | 1.09%
Expiration date |  | 3/01/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.14%, 3/08/2018 |  |
Interest rate |  | 1.14%
Expiration date |  | 3/08/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.14%, 3/15/2018 |  |
Interest rate |  | 1.14%
Expiration date |  | 3/15/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.16%, 3/22/2018 |  |
Interest rate |  | 1.16%
Expiration date |  | 3/22/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.17%, 3/29/2018 |  |
Interest rate |  | 1.17%
Expiration date |  | 3/29/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.19%, 4/05/2018 |  |
Interest rate |  | 1.19%
Expiration date |  | 4/05/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.22%, 4/12/2018 |  |
Interest rate |  | 1.22%
Expiration date |  | 4/12/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.23%, 4/19/2018 |  |
Interest rate |  | 1.23%
Expiration date |  | 4/19/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.25%, 4/26/2018 |  |
Interest rate |  | 1.25%
Expiration date |  | 4/26/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.27%, 5/03/2018 |  |
Interest rate |  | 1.27%
Expiration date |  | 5/03/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.32%, 5/10/2018 |  |
Interest rate |  | 1.32%
Expiration date |  | 5/10/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.37%, 5/17/2018 |  |
Interest rate |  | 1.37%
Expiration date |  | 5/17/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.43%, 5/24/2018 |  |
Interest rate |  | 1.43%
Expiration date |  | 5/24/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.43%, 5/31/2018 |  |
Interest rate |  | 1.43%
Expiration date |  | 5/31/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.45%, 6/07/2018 |  |
Interest rate |  | 1.45%
Expiration date |  | 6/07/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.46%, 6/14/2018 |  |
Interest rate |  | 1.46%
Expiration date |  | 6/14/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.49%, 6/21/2018 |  |
Interest rate |  | 1.49%
Expiration date |  | 6/21/2018
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,1.50%, 6/28/2018 |  |
Interest rate |  | 1.50%
Expiration date |  | 6/28/2018

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