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Condensed Schedule of Investments (Parenthetical)	9 Months Ended
	Sep. 30, 2019 USD ($)
Collateral Amount On Open Futures Contracts	$ 59,157,687
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.40%, 10/03/2019 [Member]
Interest rate	2.40%
Expiration date	10/03/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.41%, 10/10/2019 [Member]
Interest rate	2.41%
Expiration date	10/10/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.40%, 10/24/2019 [Member]
Interest rate	2.40%
Expiration date	10/24/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.37%, 10/31/2019 [Member]
Interest rate	2.37%
Expiration date	10/31/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.40%, 11/07/2019 [Member]
Interest rate	2.40%
Expiration date	11/07/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.38%, 11/14/2019 [Member]
Interest rate	2.38%
Expiration date	11/14/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.37%, 11/21/2019 [Member]
Interest rate	2.37%
Expiration date	11/21/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.33%, 11/29/2019 [Member]
Interest rate	2.33%
Expiration date	11/29/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.20%, 12/05/2019 [Member]
Interest rate	2.20%
Expiration date	12/05/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.16%, 12/12/2019 [Member]
Interest rate	2.16%
Expiration date	12/12/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.15%, 12/19/2019 [Member]
Interest rate	2.15%
Expiration date	12/19/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.07%, 12/26/2019 [Member]
Interest rate	2.07%
Expiration date	12/26/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.05%, 1/02/2020 [Member]
Interest rate	2.05%
Expiration date	1/02/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.03%, 1/09/2020 [Member]
Interest rate	2.03%
Expiration date	1/09/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.01%, 1/16/2020 [Member]
Interest rate	2.01%
Expiration date	1/16/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.04%, 1/23/2020 [Member]
Interest rate	2.04%
Expiration date	1/23/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.02%, 1/30/2020 [Member]
Interest rate	2.02%
Expiration date	1/30/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.90%, 2/06/2020 [Member]
Interest rate	1.90%
Expiration date	2/06/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.87%, 2/13/2020 [Member]
Interest rate	1.87%
Expiration date	2/13/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.85%, 2/20/2020 [Member]
Interest rate	1.85%
Expiration date	2/20/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.85%, 2/27/2020 [Member]
Interest rate	1.85%
Expiration date	2/27/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.83%, 3/05/2020 [Member]
Interest rate	1.83%
Expiration date	3/05/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.84%, 3/19/2020 [Member]
Interest rate	1.84%
Expiration date	3/19/2020
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.88%, 3/26/2020 [Member]
Interest rate	1.88%
Expiration date	3/26/2020

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