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Condensed Schedule of Investments
Jun. 30, 2019
USD ($)
contract
Open Futures Contracts Long [Member] | United States [Member]  
Notional Amount $ 4,633,186 [1]
Number of Contracts | contract 166 [1]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (540,026) [1]
% of Partners' Capital (13.18%) [1]
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG August 2019 contracts, expiring July 2019  
Notional Amount $ 372,094
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (48,974)
% of Partners' Capital (1.20%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG September 2019 contracts, expiring August 2019  
Notional Amount $ 381,053
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (61,573)
% of Partners' Capital (1.50%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG October 2019 contracts, expiring September 2019  
Notional Amount $ 374,480
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (50,940)
% of Partners' Capital (1.24%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG November 2019 contracts, expiring October 2019  
Notional Amount $ 395,632
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (59,772)
% of Partners' Capital (1.46%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG December 2019 contracts, expiring November 2019  
Notional Amount $ 413,565
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (50,265)
% of Partners' Capital (1.23%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG January 2020 contracts, expiring December 2019  
Notional Amount $ 440,912
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (61,932)
% of Partners' Capital (1.51%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2020 contracts, expiring January 2020  
Notional Amount $ 434,370
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (59,590)
% of Partners' Capital (1.45%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG March 2020 contracts, expiring February 2020  
Notional Amount $ 415,290
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (51,010)
% of Partners' Capital (1.25%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG April 2020 contracts, expiring March 2020  
Notional Amount $ 371,220
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (33,260)
% of Partners' Capital (0.81%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG May 2020 contracts, expiring April 2020  
Notional Amount $ 339,550
Number of Contracts | contract 13
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (28,980)
% of Partners' Capital (0.71%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG June 2020 contracts, expiring May 2020  
Notional Amount $ 363,500
Number of Contracts | contract 14
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (23,440)
% of Partners' Capital (0.57%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG July 2020 contracts, expiring June 2020  
Notional Amount $ 331,520
Number of Contracts | contract 13
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (10,290)
% of Partners' Capital (0.25%)
Cash Equivalents [Member]  
Market Value $ 3,681,801
% of Partners' Capital 89.84%
Cash Equivalents [Member] | United States Treasury Obligations [Member]  
Market Value $ 3,181,801
% of Partners' Capital 77.64%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 7/05/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,973
% of Partners' Capital 2.44%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.48%, 7/11/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 199,864
% of Partners' Capital 4.88%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 7/18/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,885
% of Partners' Capital 2.44%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 7/25/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,837
% of Partners' Capital 2.44%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.48%, 8/01/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 199,578
% of Partners' Capital 4.87%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.46%, 8/08/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,744
% of Partners' Capital 2.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 8/15/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 199,390
% of Partners' Capital 4.86%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 8/22/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,648
% of Partners' Capital 2.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.48%, 8/29/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,599
% of Partners' Capital 2.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.48%, 9/05/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,551
% of Partners' Capital 2.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.48%, 9/12/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,504
% of Partners' Capital 2.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.46%, 9/19/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,460
% of Partners' Capital 2.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.41%, 9/26/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 198,847
% of Partners' Capital 4.85%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.40%, 10/03/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,380
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.41%, 10/10/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,331
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.42%, 10/17/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,283
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.40%, 10/24/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,243
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.37%, 10/31/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,207
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.40%, 11/07/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,149
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.38%, 11/14/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,110
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.37%, 11/21/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 198,141
% of Partners' Capital 4.83%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.33%, 11/29/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,033
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.20%, 12/05/2019[Member]  
Principal Amount $ 100,000
Market Value $ 99,049
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.16%, 12/12/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 99,025
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.15%, 12/19/2019 [Member]  
Principal Amount $ 200,000
Market Value $ 197,981
% of Partners' Capital 4.83%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.07%, 12/26/2019 [Member]  
Principal Amount $ 100,000
Market Value $ 98,989
% of Partners' Capital 2.42%
Cash Equivalents [Member] | United States - Money Market Funds [Member]  
Market Value $ 500,000
% of Partners' Capital 12.20%
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 9.76%
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 2.44%
[1] Collateral amounted to $1,098,128 on open futures contracts.