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Schedule of Investments
Dec. 31, 2018
USD ($)
Contracts
Dec. 31, 2017
USD ($)
Contracts
Open Futures Contracts - Long [Member] | United States Contracts [Member]    
Notional Amount $ 5,685,063 [1] $ 8,907,842 [2]
Number of Contracts | Contracts 201 [1] 292 [2]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (46,103) [1] $ (568,922) [2]
% of Partners' Capital (0.82%) [1] (6.83%) [2]
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG February 2019 contracts, expiring January 2019    
Notional Amount $ 520,650  
Number of Contracts | Contracts 16  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (50,250)  
% of Partners' Capital (0.89%)  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG March 2019 contracts, expiring February 2019    
Notional Amount $ 520,524  
Number of Contracts | Contracts 17  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (35,854)  
% of Partners' Capital (0.63%)  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG April 2019 contracts, expiring March 2019    
Notional Amount $ 462,954  
Number of Contracts | Contracts 17  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (6,844)  
% of Partners' Capital (0.12%)  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG May 2019 contracts, expiring April 2019    
Notional Amount $ 450,609  
Number of Contracts | Contracts 17  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 3,631  
% of Partners' Capital 0.07%  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG June 2019 contracts, expiring May 2019    
Notional Amount $ 413,663  
Number of Contracts | Contracts 16  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 21,057  
% of Partners' Capital 0.37%  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG July 2019 contracts, expiring June 2019    
Notional Amount $ 458,258  
Number of Contracts | Contracts 17  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 10,942  
% of Partners' Capital 0.19%  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG August 2019 contracts, expiring July 2019    
Notional Amount $ 451,616  
Number of Contracts | Contracts 17  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 17,074  
% of Partners' Capital 0.30%  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG September 2019 contracts, expiring August 2019    
Notional Amount $ 462,462  
Number of Contracts | Contracts 17  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 788  
% of Partners' Capital 0.01%  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG October 2019 contracts, expiring September 2019    
Notional Amount $ 427,220  
Number of Contracts | Contracts 16  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 13,100  
% of Partners' Capital 0.23%  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG November 2019 contracts, expiring October 2019    
Notional Amount $ 480,253  
Number of Contracts | Contracts 17  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (4,423)  
% of Partners' Capital (0.08%)  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG December 2019 contracts, expiring November 2019    
Notional Amount $ 501,461  
Number of Contracts | Contracts 17  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (641)  
% of Partners' Capital (0.01%)  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG January 2020 contracts, expiring December 2019    
Notional Amount $ 535,393  
Number of Contracts | Contracts 17  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (14,683)  
% of Partners' Capital (0.26%)  
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG February 2018 contracts, expiring January 2018    
Notional Amount   $ 872,763
Number of Contracts | Contracts   24
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (164,043)
% of Partners' Capital   (1.97%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG March 2018 contracts, expiring February 2018    
Notional Amount   $ 832,869
Number of Contracts | Contracts   24
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (135,429)
% of Partners' Capital   (1.63%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG April 2018 contracts, expiring March 2018    
Notional Amount   $ 715,113
Number of Contracts | Contracts   25
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (27,863)
% of Partners' Capital   (0.33%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG May 2018 contracts, expiring April 2018    
Notional Amount   $ 685,247
Number of Contracts | Contracts   24
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (27,407)
% of Partners' Capital   (0.33%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG June 2018 contracts, expiring May 2018    
Notional Amount   $ 731,645
Number of Contracts | Contracts   25
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (38,395)
% of Partners' Capital   (0.46%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG July 2018 contracts, expiring June 2018    
Notional Amount   $ 692,833
Number of Contracts | Contracts   24
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (19,873)
% of Partners' Capital   (0.24%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG August 2018 contracts, expiring July 2018    
Notional Amount   $ 722,063
Number of Contracts | Contracts   25
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (20,313)
% of Partners' Capital   (0.24%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG September 2018 contracts, expiring August 2018    
Notional Amount   $ 693,242
Number of Contracts | Contracts   24
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (23,882)
% of Partners' Capital   (0.29%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG October 2018 contracts, expiring September 2018    
Notional Amount   $ 712,475
Number of Contracts | Contracts   24
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (37,595)
% of Partners' Capital   (0.45%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG November 2018 contracts, expiring November 2018    
Notional Amount   $ 762,732
Number of Contracts | Contracts   25
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (45,982)
% of Partners' Capital   (0.55%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG December 2018 contracts, expiring November 2018    
Notional Amount   $ 762,850
Number of Contracts | Contracts   24
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (43,570)
% of Partners' Capital   (0.52%)
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG January 2019 contracts, expiring December 2018    
Notional Amount   $ 724,010
Number of Contracts | Contracts   24
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 15,430
% of Partners' Capital   0.18%
Cash Equivalents [Member]    
Market Value $ 5,577,527 $ 7,683,698
% of Partners' Capital 98.84% 92.19%
Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Market Value $ 3,977,527 $ 5,183,698
% of Partners' Capital 70.49% 62.19%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.10%, 1/03/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,977  
% of Partners' Capital 3.54%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.10%, 1/10/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,896  
% of Partners' Capital 3.54%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.13%, 1/17/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,812  
% of Partners' Capital 3.54%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.15%, 1/24/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,729  
% of Partners' Capital 3.54%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.18%, 1/31/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,641  
% of Partners' Capital 3.54%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.20%, 2/07/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,553  
% of Partners' Capital 3.54%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.19%, 2/14/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,470  
% of Partners' Capital 3.54%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.20%, 2/21/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,382  
% of Partners' Capital 3.53%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.24%, 2/28/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,643  
% of Partners' Capital 1.77%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.38%, 3/07/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,575  
% of Partners' Capital 1.77%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.28%, 3/14/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,549  
% of Partners' Capital 1.76%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.33%, 3/21/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,495  
% of Partners' Capital 1.76%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.34%, 3/28/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 198,896  
% of Partners' Capital 3.53%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.37%, 4/04/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,394  
% of Partners' Capital 1.76%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.41%, 4/11/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,338  
% of Partners' Capital 1.76%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.42%, 4/18/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,288  
% of Partners' Capital 1.76%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.43%, 4/25/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,240  
% of Partners' Capital 1.76%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.46%, 5/02/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,185  
% of Partners' Capital 1.76%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.47%, 5/09/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 198,268  
% of Partners' Capital 3.51%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.48%, 5/16/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 99,081  
% of Partners' Capital 1.76%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.50%, 5/23/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 198,055  
% of Partners' Capital 3.51%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.49%, 5/30/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 98,983  
% of Partners' Capital 1.75%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.51%, 6/06/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 197,855  
% of Partners' Capital 3.51%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.51%, 6/13/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 197,754  
% of Partners' Capital 3.50%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.49%, 6/20/2019 [Member]    
Principal Amount $ 200,000  
Market Value $ 197,677  
% of Partners' Capital 3.50%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.49%, 6/27/2019 [Member]    
Principal Amount $ 100,000  
Market Value $ 98,791  
% of Partners' Capital 1.75%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 1/04/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,981
% of Partners' Capital   2.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.11%, 1/11/2018 [Member]    
Principal Amount   $ 300,000
Market Value   $ 299,908
% of Partners' Capital   3.60%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.10%, 1/18/2018 [Member]    
Principal Amount   $ 300,000
Market Value   $ 299,846
% of Partners' Capital   3.60%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 1/25/2018 [Member]    
Principal Amount   $ 300,000
Market Value   $ 299,777
% of Partners' Capital   3.60%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 2/01/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,808
% of Partners' Capital   2.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.13%, 2/08/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,763
% of Partners' Capital   2.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 2/15/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,723
% of Partners' Capital   2.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.10%, 2/22/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,685
% of Partners' Capital   2.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.09%, 3/01/2018 [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,822
% of Partners' Capital   1.20%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.14%, 3/08/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,585
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.14%, 3/15/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,542
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.16%, 3/22/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,489
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.17%, 3/29/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,439
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.19%, 4/05/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,381
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.22%, 4/12/2018 [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,659
% of Partners' Capital   1.19%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.23%, 4/19/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,270
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.25%, 4/26/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,208
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.27%, 5/03/2018 [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,573
% of Partners' Capital   1.19%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.32%, 5/10/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,061
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.37%, 5/17/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 198,974
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.43%, 5/24/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 198,876
% of Partners' Capital   2.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.43%, 5/31/2018 [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,408
% of Partners' Capital   1.19%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.45%, 6/07/2018 [Member]    
Principal Amount   $ 300,000
Market Value   $ 298,116
% of Partners' Capital   3.58%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.46%, 6/14/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 198,683
% of Partners' Capital   2.38%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.49%, 6/21/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 198,594
% of Partners' Capital   2.38%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.50%, 6/28/2018 [Member]    
Principal Amount   $ 200,000
Market Value   $ 198,527
% of Partners' Capital   2.38%
Cash Equivalents [Member] | United States - Money Market Funds [Member]    
Market Value $ 1,600,000 $ 2,500,000
% of Partners' Capital 28.35% 30.00%
Cash Equivalents [Member] | United States - 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   12.00%
Cash Equivalents [Member] | United States - Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount $ 1,500,000 $ 1,000,000
Market Value $ 1,500,000 $ 1,000,000
% of Partners' Capital 26.58% 12.00%
Cash Equivalents [Member] | United States - Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]    
Principal Amount $ 100,000 $ 500,000
Market Value $ 100,000 $ 500,000
% of Partners' Capital 1.77% 6.00%
[1] Collateral amounted to $596,555 on open futures contracts.
[2] Collateral amounted to $1,701,275 on open futures contracts.