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Condensed Schedule of Investments
Mar. 31, 2019
USD ($)
Contracts
Open Futures Contracts - Long [Member] | United States Contracts [Member]  
Notional Amount $ 4,657,105 [1]
Number of Contracts | Contracts 166 [1]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 58,505 [1]
% of Partners' Capital 1.24% [1]
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG May 2019 contracts, expiring April 2019  
Notional Amount $ 344,875
Number of Contracts | Contracts 13
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 1,185
% of Partners' Capital 0.03%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG June 2019 contracts, expiring May 2019  
Notional Amount $ 364,827
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 14,993
% of Partners' Capital 0.32%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG July 2019 contracts, expiring June 2019  
Notional Amount $ 375,577
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 12,503
% of Partners' Capital 0.26%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG August 2019 contracts, expiring July 2019  
Notional Amount $ 372,094
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 19,486
% of Partners' Capital 0.41%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG September 2019 contracts, expiring August 2019  
Notional Amount $ 381,053
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 9,967
% of Partners' Capital 0.21%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG October 2019 contracts, expiring September 2019  
Notional Amount $ 347,690
Number of Contracts | Contracts 13
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 18,000
% of Partners' Capital 0.38%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG November 2019 contracts, expiring October 2019  
Notional Amount $ 395,632
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 5,748
% of Partners' Capital 0.12%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG December 2019 contracts, expiring November 2019  
Notional Amount $ 413,565
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 7,135
% of Partners' Capital 0.15%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG January 2020 contracts, expiring December 2019  
Notional Amount $ 440,912
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (8,732)
% of Partners' Capital (0.18%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG February 2020 contracts, expiring January 2020  
Notional Amount $ 434,370
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (10,310)
% of Partners' Capital (0.22%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG March 2020 contracts, expiring February 2020  
Notional Amount $ 415,290
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (7,050)
% of Partners' Capital (0.15%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG April 2020 contracts, expiring March 2020  
Notional Amount $ 371,220
Number of Contracts | Contracts 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (4,420)
% of Partners' Capital (0.09%)
Cash Equivalents [Member]  
Market Value $ 3,978,308
% of Partners' Capital 84.23%
Cash Equivalents [Member] | United States Treasury Obligations [Member]  
Market Value $ 3,478,308
% of Partners' Capital 73.64%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.37%, 4/04/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,980
% of Partners' Capital 2.12%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.41%, 4/11/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,934
% of Partners' Capital 2.12%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.42%, 4/18/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,887
% of Partners' Capital 2.12%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.43%, 4/25/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,840
% of Partners' Capital 2.11%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.46%, 5/02/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,791
% of Partners' Capital 2.11%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.47%, 5/09/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 199,486
% of Partners' Capital 4.22%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.48%, 5/16/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,694
% of Partners' Capital 2.11%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.50%, 5/23/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 199,288
% of Partners' Capital 4.22%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.49%, 5/30/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,597
% of Partners' Capital 2.11%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.51%, 6/06/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 199,092
% of Partners' Capital 4.22%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.51%, 6/13/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 198,994
% of Partners' Capital 4.21%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.49%, 6/20/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 198,907
% of Partners' Capital 4.21%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.49%, 6/27/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,406
% of Partners' Capital 2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.47%, 7/05/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,357
% of Partners' Capital 2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.48%, 7/11/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 198,624
% of Partners' Capital 4.21%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.47%, 7/18/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,268
% of Partners' Capital 2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.47%, 7/25/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,221
% of Partners' Capital 2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.48%, 8/01/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 198,339
% of Partners' Capital 4.20%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.46%, 8/08/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,129
% of Partners' Capital 2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.47%, 8/15/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 198,156
% of Partners' Capital 4.20%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.47%, 8/22/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,033
% of Partners' Capital 2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.48%, 8/29/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 98,979
% of Partners' Capital 2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.48%, 9/05/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 98,932
% of Partners' Capital 2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.48%, 9/12/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 98,886
% of Partners' Capital 2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.46%, 9/19/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 98,846
% of Partners' Capital 2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.41%, 9/26/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 197,642
% of Partners' Capital 4.18%
Cash Equivalents [Member] | United States - Money Market Funds [Member]  
Market Value $ 500,000
% of Partners' Capital 10.59%
Cash Equivalents [Member] | United States - Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]  
Principal Amount $ 400,000
Market Value $ 400,000
% of Partners' Capital 8.47%
Cash Equivalents [Member] | United States - Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]  
Principal Amount $ 100,000
Market Value $ 100,000
% of Partners' Capital 2.12%
[1] Collateral amounted to $978,236 on open futures contracts.