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Condensed Schedule of Investments
Mar. 31, 2018
USD ($)
United States Contracts [Member] | Money Market Funds [Member]  
Market Value $ 2,100,000
% of Partners' Capital 30.14%
United States Contracts [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]  
Principal Amount $ 1,000,000
Market Value $ 1,000,000
% of Partners' Capital 14.35%
United States Contracts [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 14.35%
United States Contracts [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]  
Principal Amount $ 100,000
Market Value $ 100,000
% of Partners' Capital 1.44%
Open Futures Contracts - Long [Member] | United States Contracts [Member]  
Notional Amount $ 7,128,265 [1]
Number of Contracts 242 [1]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (161,545) [1]
% of Partners' Capital (2.32%) [1]
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG May 2018 contracts, expiring April 2018 [Member]  
Notional Amount $ 599,830
Number of Contracts 21
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (25,900)
% of Partners' Capital (0.37%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG June 2018 contracts, expiring May 2018 [Member]  
Notional Amount $ 586,474
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (30,874)
% of Partners' Capital (0.44%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG July 2018 contracts, expiring June 2018 [Member]  
Notional Amount $ 577,315
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (10,915)
% of Partners' Capital (0.16%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG August 2018 contracts, expiring July 2018 [Member]  
Notional Amount $ 577,515
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (8,115)
% of Partners' Capital (0.12%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG September 2018 contracts, expiring August 2018 [Member]  
Notional Amount $ 577,785
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (11,185)
% of Partners' Capital (0.16%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG October 2018 contracts, expiring September 2018 [Member]  
Notional Amount $ 594,923
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (25,723)
% of Partners' Capital (0.37%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG November 2018 contracts, expiring November 2018 [Member]  
Notional Amount $ 610,960
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (33,160)
% of Partners' Capital (0.47%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG December 2018 contracts, expiring November 2018 [Member]  
Notional Amount $ 636,478
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (34,078)
% of Partners' Capital (0.49%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG January 2019 contracts, expiring December 2018 [Member]  
Notional Amount $ 604,105
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 14,895
% of Partners' Capital 0.21%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG February 2019 contracts, expiring January 2019 [Member]  
Notional Amount $ 643,670
Number of Contracts 21
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,280)
% of Partners' Capital (0.02%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG March 2019 contracts, expiring February 2019 [Member]  
Notional Amount $ 577,191
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 13,809
% of Partners' Capital 0.20%
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG April 2019 contracts, expiring March 2019 [Member]  
Notional Amount $ 542,019
Number of Contracts 20
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (9,019)
% of Partners' Capital (0.13%)
Cash Equivalents [Member] | United States Treasury Obligations [Member]  
Market Value $ 4,879,344
% of Partners' Capital 70.03%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.19%, 4/05/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,974
% of Partners' Capital 2.87%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.22%, 4/12/2018 [Member]  
Principal Amount $ 100,000
Market Value $ 99,963
% of Partners' Capital 1.44%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.23%, 4/19/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,878
% of Partners' Capital 2.87%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.25%, 4/26/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,828
% of Partners' Capital 2.87%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.27%, 5/03/2018 [Member]  
Principal Amount $ 100,000
Market Value $ 99,888
% of Partners' Capital 1.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.32%, 5/10/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,716
% of Partners' Capital 2.87%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.37%, 5/17/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,653
% of Partners' Capital 2.87%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.43%, 5/24/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,583
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.43%, 5/31/2018 [Member]  
Principal Amount $ 100,000
Market Value $ 99,763
% of Partners' Capital 1.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.45%, 6/07/2018 [Member]  
Principal Amount $ 300,000
Market Value $ 299,196
% of Partners' Capital 4.29%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.46%, 6/14/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,406
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.49%, 6/21/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,334
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.50%, 6/28/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,272
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.56%, 7/05/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,182
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.56%, 7/12/2018 [Member]  
Principal Amount $ 300,000
Market Value $ 298,683
% of Partners' Capital 4.29%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.60%, 7/19/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 199,037
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.61%, 7/26/2018 [Member]  
Principal Amount $ 300,000
Market Value $ 298,458
% of Partners' Capital 4.28%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.63%, 8/02/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 198,893
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.71%, 8/09/2018 [Member]  
Principal Amount $ 100,000
Market Value $ 99,388
% of Partners' Capital 1.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.77%, 8/16/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 198,664
% of Partners' Capital 2.85%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.82%, 8/23/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 198,560
% of Partners' Capital 2.85%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.82%, 8/30/2018 [Member]  
Principal Amount $ 100,000
Market Value $ 99,243
% of Partners' Capital 1.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.85%, 9/06/2018 [Member]  
Principal Amount $ 100,000
Market Value $ 99,197
% of Partners' Capital 1.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.90%, 9/13/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 198,272
% of Partners' Capital 2.85%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.92%, 9/20/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 198,180
% of Partners' Capital 2.84%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.90%, 9/27/2018 [Member]  
Principal Amount $ 200,000
Market Value $ 198,133
% of Partners' Capital 2.84%
Cash Equivalents [Member] | United States Contracts [Member]  
Market Value $ 6,979,344
% of Partners' Capital 100.17%
[1] Collateral amounted to $979,150 on open futures contracts.