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Condensed Schedule of Investments (Parenthetical) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017
Collateral Amount On Open Futures Contracts |  | $ 4,977,569
United States | U.S. Treasury Bills 1.56%, 7/05/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.56% |
Expiration date | 7/05/2018 |
United States | U.S. Treasury Bills 1.56%, 7/12/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.56% |
Expiration date | 7/12/2018 |
United States | U.S. Treasury Bills 1.60%, 7/19/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.60% |
Expiration date | 7/19/2018 |
United States | U.S. Treasury Bills 1.61%, 7/26/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.61% |
Expiration date | 7/26/2018 |
United States | U.S. Treasury Bills 1.63%, 8/02/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.63% |
Expiration date | 8/02/2018 |
United States | U.S. Treasury Bills 1.71%, 8/09/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.71% |
Expiration date | 8/09/2018 |
United States | U.S. Treasury Bills 1.77%, 8/16/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.77% |
Expiration date | 8/16/2018 |
United States | U.S. Treasury Bills 1.82%, 8/23/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.82% |
Expiration date | 8/23/2018 |
United States | U.S. Treasury Bills 1.82%, 8/30/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.82% |
Expiration date | 8/30/2018 |
United States | U.S. Treasury Bills 1.85%, 9/06/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.85% |
Expiration date | 9/06/2018 |
United States | U.S. Treasury Bills 1.90%, 9/13/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.90% |
Expiration date | 9/13/2018 |
United States | U.S. Treasury Bills 1.92%, 9/20/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.92% |
Expiration date | 9/20/2018 |
United States | U.S. Treasury Bills 1.90%, 9/27/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.90% |
Expiration date | 9/27/2018 |
United States | U.S. Treasury Bills 1.87%, 10/04/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.87% |
Expiration date | 10/04/2018 |
United States | U.S. Treasury Bills 1.90%, 10/11/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.90% |
Expiration date | 10/11/2018 |
United States | U.S. Treasury Bills 1.97%, 10/18/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 1.97% |
Expiration date | 10/18/2018 |
United States | U.S. Treasury Bills 2.00%, 10/25/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.00% |
Expiration date | 10/25/2018 |
United States | U.S. Treasury Bills 2.00%, 11/01/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.00% |
Expiration date | 11/01/2018 |
United States | U.S. Treasury Bills 2.03%, 11/08/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.03% |
Expiration date | 11/08/2018 |
United States | U.S. Treasury Bills 2.05%, 11/15/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.05% |
Expiration date | 11/15/2018 |
United States | U.S. Treasury Bills 2.07%, 11/23/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.07% |
Expiration date | 11/23/2018 |
United States | U.S. Treasury Bills 2.05%, 11/29/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.05% |
Expiration date | 11/29/2018 |
United States | U.S.Treasury Bills 2.09%, 12/06/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.09% |
Expiration date | 12/06/2018 |
United States | U.S.Treasury Bills 2.06%, 12/13/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.06% |
Expiration date | 12/13/2018 |
United States | U.S.Treasury Bills 2.09%, 12/20/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.09% |
Expiration date | 12/20/2018 |
United States | U.S.Treasury Bills 2.07%, 12/27/2018 | US Treasury Securities | Cash Equivalents |  |
Interest rate | 2.07% |
Expiration date | 12/27/2018 |

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