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v3.20.1

Schedule of Investments (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Collateral Amount On Open Futures Contracts | $ 83,410,316 | $ 100,299,442
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.10%, 1/03/2019 [Member] |  |
Interest rate |  | 2.10%
Expiration date |  | 1/03/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.10%, 1/10/2019 [Member] |  |
Interest rate |  | 2.10%
Expiration date |  | 1/10/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.13%, 1/17/2019 [Member] |  |
Interest rate |  | 2.13%
Expiration date |  | 1/17/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.15%, 1/24/2019 [Member] |  |
Interest rate |  | 2.15%
Expiration date |  | 1/24/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.18%, 1/31/2019 [Member] |  |
Interest rate |  | 2.18%
Expiration date |  | 1/31/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.20%, 2/07/2019 [Member] |  |
Interest rate |  | 2.20%
Expiration date |  | 2/07/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.20%, 2/21/2019 [Member] |  |
Interest rate |  | 2.20%
Expiration date |  | 2/21/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.38%, 3/07/2019 [Member] |  |
Interest rate |  | 2.38%
Expiration date |  | 3/07/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.28%, 3/14/2019 [Member] |  |
Interest rate |  | 2.28%
Expiration date |  | 3/14/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.33%, 3/21/2019 [Member] |  |
Interest rate |  | 2.33%
Expiration date |  | 3/21/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.34%, 3/28/2019 [Member] |  |
Interest rate |  | 2.34%
Expiration date |  | 3/28/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.37%, 4/04/2019 [Member] |  |
Interest rate |  | 2.37%
Expiration date |  | 4/04/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.41%, 4/11/2019 [Member] |  |
Interest rate |  | 2.41%
Expiration date |  | 4/11/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.42%, 4/18/2019 [Member] |  |
Interest rate |  | 2.42%
Expiration date |  | 4/18/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.43%, 4/25/2019 [Member] |  |
Interest rate |  | 2.43%
Expiration date |  | 4/25/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.47%, 5/09/2019 [Member] |  |
Interest rate |  | 2.47%
Expiration date |  | 5/09/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.48%, 5/16/2019 [Member] |  |
Interest rate |  | 2.48%
Expiration date |  | 5/16/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.50%, 5/23/2019 [Member] |  |
Interest rate |  | 2.50%
Expiration date |  | 5/23/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.49%, 5/30/2019 [Member] |  |
Interest rate |  | 2.49%
Expiration date |  | 5/30/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.51%, 6/06/2019 [Member] |  |
Interest rate |  | 2.51%
Expiration date |  | 6/06/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.51%, 6/13/2019 [Member] |  |
Interest rate |  | 2.51%
Expiration date |  | 6/13/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.49%, 6/20/2019 [Member] |  |
Interest rate |  | 2.49%
Expiration date |  | 6/20/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.49%, 6/27/2019 [Member] |  |
Interest rate |  | 2.49%
Expiration date |  | 6/27/2019
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.05%, 1/02/2020 [Member] |  |
Interest rate | 2.05% |
Expiration date | 1/02/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.03%, 1/09/2020 [Member] |  |
Interest rate | 2.03% |
Expiration date | 1/09/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.01%, 1/16/2020 [Member] |  |
Interest rate | 2.01% |
Expiration date | 1/16/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.04%, 1/23/2020 [Member] |  |
Interest rate | 2.04% |
Expiration date | 1/23/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 2.02%, 1/30/2020 [Member] |  |
Interest rate | 2.02% |
Expiration date | 1/30/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.90%, 2/06/2020 [Member] |  |
Interest rate | 1.90% |
Expiration date | 2/06/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.87%, 2/13/2020 [Member] |  |
Interest rate | 1.87% |
Expiration date | 2/13/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.85%, 2/20/2020 [Member] |  |
Interest rate | 1.85% |
Expiration date | 2/20/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.85%, 2/27/2020 [Member] |  |
Interest rate | 1.85% |
Expiration date | 2/27/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.83%, 3/05/2020 [Member] |  |
Interest rate | 1.83% |
Expiration date | 3/05/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.84%, 3/19/2020 [Member] |  |
Interest rate | 1.84% |
Expiration date | 3/19/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.88%, 3/26/2020 [Member] |  |
Interest rate | 1.88% |
Expiration date | 3/26/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.70%, 4/02/2020 [Member] |  |
Interest rate | 1.70% |
Expiration date | 4/02/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.64%, 4/09/2020 [Member] |  |
Interest rate | 1.64% |
Expiration date | 4/09/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.60%, 4/16/2020 [Member] |  |
Interest rate | 1.60% |
Expiration date | 4/16/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.60%, 4/23/2020 [Member] |  |
Interest rate | 1.60% |
Expiration date | 4/23/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.59%, 4/30/2020 [Member] |  |
Interest rate | 1.59% |
Expiration date | 4/30/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.54%, 5/07/2020 [Member] |  |
Interest rate | 1.54% |
Expiration date | 5/07/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.55%, 5/14/2020 [Member] |  |
Interest rate | 1.55% |
Expiration date | 5/14/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.55%, 5/21/2020 [Member] |  |
Interest rate | 1.55% |
Expiration date | 5/21/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.58%, 5/28/2020 [Member] |  |
Interest rate | 1.58% |
Expiration date | 5/28/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.53%, 6/04/2020 [Member] |  |
Interest rate | 1.53% |
Expiration date | 6/04/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.53%, 6/11/2020 [Member] |  |
Interest rate | 1.53% |
Expiration date | 6/11/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.54%, 6/18/2020 [Member] |  |
Interest rate | 1.54% |
Expiration date | 6/18/2020 |
United States Treasury Obligations [Member] | Cash Equivalents [Member] | U.S. Treasury Bills, 1.57%, 6/25/2020 [Member] |  |
Interest rate | 1.57% |
Expiration date | 6/25/2020 |

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