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Condensed Schedule of Investments (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Collateral Amount On Open Futures Contracts | $ 144,626,242 | $ 249,864,944
United States [Member] | US Treasury Bill Securities One [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.12% | 0.34%
Expiration date | 1/04/2018 | 1/05/2017
United States [Member] | US Treasury Bill Securities Two [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.11% | 0.38%
Expiration date | 1/11/2018 | 1/12/2017
United States [Member] | US Treasury Bill Securities Three [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.10% | 0.43%
Expiration date | 1/18/2018 | 1/19/2017
United States [Member] | US Treasury Bill Securities Four [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.12% | 0.36%
Expiration date | 1/25/2018 | 1/26/2017
United States [Member] | US Treasury Bill Securities Five [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.12% | 0.40%
Expiration date | 2/01/2018 | 2/02/2017
United States [Member] | US Treasury Bill Securities Six [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.13% | 0.42%
Expiration date | 2/08/2018 | 2/09/2017
United States [Member] | US Treasury Bill Securities Seven [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.12% | 0.45%
Expiration date | 2/15/2018 | 2/16/2017
United States [Member] | US Treasury Bill Securities Eight [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.10% | 0.45%
Expiration date | 2/22/2018 | 2/23/2017
United States [Member] | US Treasury Bill Securities Nine [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.09% | 0.45%
Expiration date | 3/01/2018 | 3/02/2017
United States [Member] | US Treasury Bill Securities Ten [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.14% | 0.47%
Expiration date | 3/08/2018 | 3/09/2017
United States [Member] | US Treasury Bill Securities Eleven [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.14% | 0.50%
Expiration date | 3/15/2018 | 3/16/2017
United States [Member] | US Treasury Bill Securities Twelve [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.16% | 0.45%
Expiration date | 3/22/2018 | 3/23/2017
United States [Member] | US Treasury Bill Securities Thirteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.17% | 0.43%
Expiration date | 3/29/2018 | 3/30/2017
United States [Member] | US Treasury Bill Securities Fourteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.19% | 0.46%
Expiration date | 4/05/2018 | 4/06/2017
United States [Member] | US Treasury Bill Securities Fifteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.22% | 0.47%
Expiration date | 4/12/2018 | 4/13/2017
United States [Member] | US Treasury Bill Securities Sixteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 2.45% | 0.46%
Expiration date | 4/19/2018 | 4/20/2017
United States [Member] | US Treasury Bill Securities Seventeen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.25% | 0.47%
Expiration date | 4/26/2018 | 4/27/2017
United States [Member] | US Treasury Bill Securities Eighteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.27% | 0.52%
Expiration date | 5/03/2018 | 5/04/2017
United States [Member] | US Treasury Bill Securities Nineteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.32% | 0.55%
Expiration date | 5/10/2018 | 5/11/2017
United States [Member] | US Treasury Bill Securities Twenty [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.37% | 0.60%
Expiration date | 5/17/2018 | 5/18/2017
United States [Member] | US Treasury Bill Securities Twenty One [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.43% | 0.61%
Expiration date | 5/24/2018 | 5/25/2017
United States [Member] | US Treasury Bill Securities Twenty Two [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.43% | 0.60%
Expiration date | 5/31/2018 | 6/01/2017
United States [Member] | US Treasury Bill Securities Twenty Three [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.45% | 0.62%
Expiration date | 6/07/2018 | 6/08/2017
United States [Member] | US Treasury Bill Securities Twenty Four [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.46% | 0.65%
Expiration date | 6/14/2018 | 6/15/2017
United States [Member] | US Treasury Bill Securities Twenty Five [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.49% | 0.64%
Expiration date | 6/21/2018 | 6/22/2017
United States [Member] | US Treasury Bill Securities Twenty Six [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |  |
Interest rate | 1.50% | 0.60%
Expiration date | 6/28/2018 | 6/29/2017

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