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Schedule of Investments
Dec. 31, 2019
USD ($)
contract
Dec. 31, 2018
USD ($)
contract
Open Futures Contracts Long [Member] | United States [Member]    
Notional Amount $ 3,812,638 [1] $ 5,685,063 [2]
Number of Contracts | contract 145 [1] 201 [2]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (435,678) [1] $ (46,103) [2]
% of Partners' Capital (12.91%) [1] (0.82%) [2]
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2019 contracts, expiring January 2019    
Notional Amount   $ 520,650
Number of Contracts | contract   16
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (50,250)
% of Partners' Capital   (0.89%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG March 2019 contracts, expiring February 2019    
Notional Amount   $ 520,524
Number of Contracts | contract   17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (35,854)
% of Partners' Capital   (0.63%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG April 2019 contracts, expiring March 2019    
Notional Amount   $ 462,954
Number of Contracts | contract   17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (6,844)
% of Partners' Capital   (0.12%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG May 2019 contracts, expiring April 2019    
Notional Amount   $ 450,609
Number of Contracts | contract   17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 3,631
% of Partners' Capital   0.07%
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG June 2019 contracts, expiring May 2019    
Notional Amount   $ 413,663
Number of Contracts | contract   16
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 21,057
% of Partners' Capital   0.37%
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG July 2019 contracts, expiring June 2019    
Notional Amount   $ 458,258
Number of Contracts | contract   17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 10,942
% of Partners' Capital   0.19%
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG August 2019 contracts, expiring July 2019    
Notional Amount   $ 451,616
Number of Contracts | contract   17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 17,074
% of Partners' Capital   0.30%
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG September 2019 contracts, expiring August 2019    
Notional Amount   $ 462,462
Number of Contracts | contract   17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 788
% of Partners' Capital   0.01%
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG October 2019 contracts, expiring September 2019    
Notional Amount   $ 427,220
Number of Contracts | contract   16
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 13,100
% of Partners' Capital   0.23%
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG November 2019 contracts, expiring October 2019    
Notional Amount   $ 480,253
Number of Contracts | contract   17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (4,423)
% of Partners' Capital   (0.08%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG December 2019 contracts, expiring November 2019    
Notional Amount   $ 501,461
Number of Contracts | contract   17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (641)
% of Partners' Capital   (0.01%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG January 2020 contracts, expiring December 2019    
Notional Amount   $ 535,393
Number of Contracts | contract   17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (14,683)
% of Partners' Capital   (0.26%)
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2020 contracts, expiring January 2020    
Notional Amount $ 372,317  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (109,637)  
% of Partners' Capital (3.25%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG March 2020 contracts, expiring February 2020    
Notional Amount $ 355,883  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (96,923)  
% of Partners' Capital (2.87%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG April 2020 contracts, expiring March 2020    
Notional Amount $ 318,189  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (60,309)  
% of Partners' Capital (1.79%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG May 2020 contracts, expiring April 2020    
Notional Amount $ 337,171  
Number of Contracts | contract 13  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (52,731)  
% of Partners' Capital (1.56%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG June 2020 contracts, expiring May 2020    
Notional Amount $ 311,571  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (42,051)  
% of Partners' Capital (1.25%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG July 2020 contracts, expiring June 2020    
Notional Amount $ 306,018  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (29,658)  
% of Partners' Capital (0.88%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG August 2020 contracts, expiring July 2020    
Notional Amount $ 303,009  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (24,729)  
% of Partners' Capital (0.73%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG September 2020 contracts, expiring August 2020    
Notional Amount $ 277,911  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (591)  
% of Partners' Capital (0.02%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG October 2020 contracts, expiring September 2020    
Notional Amount $ 294,317  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (12,797)  
% of Partners' Capital (0.38%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG November 2020 contracts, expiring October 2020    
Notional Amount $ 291,221  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 19  
% of Partners' Capital [3] 0.00%  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG December 2020 contracts, expiring November 2020    
Notional Amount $ 323,237  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (10,877)  
% of Partners' Capital (0.32%)  
Open Futures Contracts Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG January 2021 contracts, expiring December 2020    
Notional Amount $ 321,794  
Number of Contracts | contract 12  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 4,606  
% of Partners' Capital 0.14%  
Cash Equivalents [Member]    
Market Value $ 3,289,117 $ 5,577,527
% of Partners' Capital 97.49% 98.84%
Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Market Value $ 2,789,117 $ 3,977,527
% of Partners' Capital 82.67% 70.49%
Cash Equivalents [Member] | United States - Money Market Funds [Member]    
Market Value $ 500,000 $ 1,600,000
% of Partners' Capital 14.82% 28.35%
Cash Equivalents [Member] | United States - Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount $ 400,000 $ 1,500,000
Market Value $ 400,000 $ 1,500,000
% of Partners' Capital 11.86% 26.58%
Cash Equivalents [Member] | United States - Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]    
Principal Amount $ 100,000 $ 100,000
Market Value $ 100,000 $ 100,000
% of Partners' Capital 2.96% 1.77%
U.S. Treasury Bills: 2.10%, 1/03/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,977
% of Partners' Capital   3.54%
U.S. Treasury Bills:2.10%, 1/10/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,896
% of Partners' Capital   3.54%
U.S. Treasury Bills:2.13%, 1/17/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,812
% of Partners' Capital   3.54%
U.S. Treasury Bills:2.15%, 1/24/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,729
% of Partners' Capital   3.54%
U.S. Treasury Bills:2.18%, 1/31/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,641
% of Partners' Capital   3.54%
U.S. Treasury Bills:2.20%, 2/07/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,553
% of Partners' Capital   3.54%
U.S. Treasury Bills:2.19%, 2/14/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,470
% of Partners' Capital   3.54%
U.S. Treasury Bills:2.20%, 2/21/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 199,382
% of Partners' Capital   3.53%
U.S. Treasury Bills:2.24%, 2/28/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,643
% of Partners' Capital   1.77%
U.S. Treasury Bills:2.38%, 3/07/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,575
% of Partners' Capital   1.77%
U.S. Treasury Bills:2.28%, 3/14/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,549
% of Partners' Capital   1.76%
U.S. Treasury Bills:2.33%, 3/21/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,495
% of Partners' Capital   1.76%
U.S. Treasury Bills:2.34%, 3/28/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 198,896
% of Partners' Capital   3.53%
U.S. Treasury Bills:2.37%, 4/04/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,394
% of Partners' Capital   1.76%
U.S. Treasury Bills:2.41%, 4/11/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,338
% of Partners' Capital   1.76%
U.S. Treasury Bills:2.42%, 4/18/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,288
% of Partners' Capital   1.76%
U.S. Treasury Bills:2.43%, 4/25/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,240
% of Partners' Capital   1.76%
U.S. Treasury Bills:2.46%, 5/02/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,185
% of Partners' Capital   1.76%
U.S. Treasury Bills:2.47%, 5/09/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 198,268
% of Partners' Capital   3.51%
U.S. Treasury Bills:2.48%, 5/16/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 99,081
% of Partners' Capital   1.76%
U.S. Treasury Bills:2.50%, 5/23/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 198,055
% of Partners' Capital   3.51%
U.S. Treasury Bills:2.49%, 5/30/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 98,983
% of Partners' Capital   1.75%
U.S. Treasury Bills:2.51%, 6/06/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 197,855
% of Partners' Capital   3.51%
U.S. Treasury Bills:2.51%, 6/13/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 197,754
% of Partners' Capital   3.50%
U.S. Treasury Bills:2.49%, 6/20/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 200,000
Market Value   $ 197,677
% of Partners' Capital   3.50%
U.S. Treasury Bills:2.49%, 6/27/2019 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount   $ 100,000
Market Value   $ 98,791
% of Partners' Capital   1.75%
U.S. Treasury Bills:2.05%, 1/02/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,994  
% of Partners' Capital 2.96%  
U.S. Treasury Bills:2.03%, 1/09/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 200,000  
Market Value $ 199,911  
% of Partners' Capital 5.93%  
U.S. Treasury Bills:2.01%, 1/16/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,917  
% of Partners' Capital 2.96%  
U.S. Treasury Bills:2.04%, 1/23/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,877  
% of Partners' Capital 2.96%  
U.S. Treasury Bills:2.02%, 1/30/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,839  
% of Partners' Capital 2.96%  
U.S. Treasury Bills:1.90%, 2/06/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,812  
% of Partners' Capital 2.96%  
U.S. Treasury Bills:1.87%, 2/13/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,778  
% of Partners' Capital 2.96%  
U.S. Treasury Bills:1.85%, 2/20/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,745  
% of Partners' Capital 2.96%  
U.S. Treasury Bills:1.85%, 2/27/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,710  
% of Partners' Capital 2.96%  
U.S. Treasury Bills:1.83%, 3/05/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 200,000  
Market Value $ 199,354  
% of Partners' Capital 5.91%  
U.S. Treasury Bills:1.84%, 3/19/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,606  
% of Partners' Capital 2.95%  
U.S. Treasury Bills:1.88%, 3/26/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 200,000  
Market Value $ 199,122  
% of Partners' Capital 5.90%  
U.S. Treasury Bills:1.70%, 4/02/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,568  
% of Partners' Capital 2.95%  
U.S. Treasury Bills:1.64%, 4/09/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,552  
% of Partners' Capital 2.95%  
U.S. Treasury Bills:1.60%, 4/16/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,532  
% of Partners' Capital 2.95%  
U.S. Treasury Bills:1.60%, 4/23/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,501  
% of Partners' Capital 2.95%  
U.S. Treasury Bills:1.59%, 4/30/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,475  
% of Partners' Capital 2.95%  
U.S. Treasury Bills:1.54%, 5/07/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,462  
% of Partners' Capital 2.95%  
U.S. Treasury Bills:1.55%, 5/14/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,427  
% of Partners' Capital 2.95%  
U.S. Treasury Bills:1.55%, 5/21/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,399  
% of Partners' Capital 2.95%  
U.S. Treasury Bills:1.58%, 5/28/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,354  
% of Partners' Capital 2.94%  
U.S. Treasury Bills:1.53%, 6/04/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,346  
% of Partners' Capital 2.94%  
U.S. Treasury Bills:1.53%, 6/11/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,315  
% of Partners' Capital 2.94%  
U.S. Treasury Bills:1.54%, 6/18/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,284  
% of Partners' Capital 2.94%  
U.S. Treasury Bills:1.57%, 6/25/2020 [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Principal Amount $ 100,000  
Market Value $ 99,237  
% of Partners' Capital 2.94%  
[1] Collateral amounted to $803,973 on open futures contracts.
[2] Collateral amounted to $596,555 on open futures contracts.
[3] Represents less than 0.005%.