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Condensed Schedule of Investments	Sep. 30, 2017 USD ($) Contracts
United States [Member] | Open Futures Contracts - Long [Member]
Number of Contracts | Contracts	312	[1]
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ (275,316)	[1]
% of Partners' Capital	(2.89%)	[1]
Notional Amount	$ 9,793,136	[1]
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG November 2017 contracts, expiring October 2017 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ (87,947)
% of Partners' Capital	(0.92%)
Notional Amount	$ 869,767
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG December 2017 contracts, expiring November 2017 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ (10,254)
% of Partners' Capital	(0.11%)
Notional Amount	$ 837,314
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG January 2018 contracts, expiring December 2017 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ (93,326)
% of Partners' Capital	(0.98%)
Notional Amount	$ 950,026
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG February 2018 contracts, expiring January 2018 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ (95,085)
% of Partners' Capital	(1.00%)
Notional Amount	$ 952,825
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG March 2018 contracts, expiring February 2018 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ (63,455)
% of Partners' Capital	(0.67%)
Notional Amount	$ 908,195
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG April 2018 contracts, expiring March 2018 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ 19,994
% of Partners' Capital	0.21%
Notional Amount	$ 744,146
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG May 2018 contracts, expiring April 2018 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ 12,393
% of Partners' Capital	0.13%
Notional Amount	$ 742,647
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG June 2018 contracts, expiring May 2018 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ (616)
% of Partners' Capital	(0.01%)
Notional Amount	$ 762,416
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG July 2018 contracts, expiring June 2018 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ 17,530
% of Partners' Capital	0.18%
Notional Amount	$ 750,510
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG August 2018 contracts, expiring July 2018 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ 17,790
% of Partners' Capital	0.19%
Notional Amount	$ 750,770
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG September 2018 contracts, expiring August 2018 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ 11,980
% of Partners' Capital	0.13%
Notional Amount	$ 751,120
United States [Member] | Open Futures Contracts - Long [Member] | NYMEX Natural Gas Futures NG October 2018 contracts, expiring September 2018 [Member]
Number of Contracts | Contracts	26
Value/Unrealized Gain (Loss) on Open Commodity Contracts	$ (4,320)
% of Partners' Capital	(0.04%)
Notional Amount	$ 773,400
United States [Member] | Money Market Funds [Member]
Market Value	$ 3,400,000
% of Partners' Capital	35.74%
United States [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]
Principal Amount	$ 1,400,000
Market Value	$ 1,400,000
% of Partners' Capital	14.72%
United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount	$ 1,000,000
Market Value	$ 1,000,000
% of Partners' Capital	10.51%
United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]
Principal Amount	$ 1,000,000
Market Value	$ 1,000,000
% of Partners' Capital	10.51%
Cash Equivalents [Member] | United States Treasury Obligations [Member]
Market Value	$ 5,384,968
% of Partners' Capital	56.63%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 0.90%, 10/05/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,980
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 0.92%, 10/12/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,944
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 0.91%, 10/19/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,909
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 0.95%, 10/26/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,868
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 0.97%, 11/02/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,828
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.01%, 11/09/2017 [Member]
Principal Amount	$ 300,000
Market Value	$ 299,673
% of Partners' Capital	3.15%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 0.98%, 11/16/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,750
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.05%, 11/24/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,686
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.05%, 11/30/2017 [Member]
Principal Amount	$ 100,000
Market Value	$ 99,826
% of Partners' Capital	1.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.08%, 12/07/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,602
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.09%, 12/14/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,556
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.11%, 12/21/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,505
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.10%, 12/28/2017 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,465
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 1/04/2018 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,412
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.11%, 1/11/2018 [Member]
Principal Amount	$ 300,000
Market Value	$ 299,061
% of Partners' Capital	3.15%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.10%, 1/18/2018 [Member]
Principal Amount	$ 300,000
Market Value	$ 299,010
% of Partners' Capital	3.15%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 1/25/2018 [Member]
Principal Amount	$ 300,000
Market Value	$ 298,922
% of Partners' Capital	3.14%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 2/01/2018 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,238
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.13%, 2/08/2018 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,188
% of Partners' Capital	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 2/15/2018 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,155
% of Partners' Capital	2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.10%, 2/22/2018 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,128
% of Partners' Capital	2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.09%, 3/01/2018 [Member]
Principal Amount	$ 100,000
Market Value	$ 99,545
% of Partners' Capital	1.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.14%, 3/08/2018 [Member]
Principal Amount	$ 200,000
Market Value	$ 199,006
% of Partners' Capital	2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.14%, 3/15/2018 [Member]
Principal Amount	$ 200,000
Market Value	$ 198,964
% of Partners' Capital	2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.16%, 3/22/2018 [Member]
Principal Amount	$ 200,000
Market Value	$ 198,901
% of Partners' Capital	2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.17%, 3/29/2018 [Member]
Principal Amount	$ 200,000
Market Value	$ 198,846
% of Partners' Capital	2.09%
Cash Equivalents [Member] | United States [Member]
Market Value	$ 8,784,968
% of Partners' Capital	92.37%
[1] Collateral amounted to $1,411,924 on open futures contracts.

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