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Schedule of Investments
Dec. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Market Value $ 1,000,000  
% of Partners' Capital 13.60%  
RBC U.S. Government Money Market Fund - Institutional Share Class, 0.02% [Member]    
Principal Amount [1] $ 1,000,000  
Market Value [1] $ 1,000,000  
% of Partners' Capital [1] 13.60%  
Open Commodity Futures Contracts - Long [Member] | United States [Member]    
Notional Amount $ 7,378,984 [2] $ 3,812,638 [3]
Number of Contracts | contract 273 [2] 145 [3]
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (21,964) [2] $ (435,678) [3]
% of Partners' Capital (0.29%) [2] (12.91%) [3]
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (109,637)
% of Partners' Capital   (3.25%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (96,923)
% of Partners' Capital   (2.87%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (60,309)
% of Partners' Capital   (1.79%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (52,731)
% of Partners' Capital   (1.56%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (42,051)
% of Partners' Capital   (1.25%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (29,658)
% of Partners' Capital   (0.88%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (24,729)
% of Partners' Capital   (0.73%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (591)
% of Partners' Capital   (0.02%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (12,797)
% of Partners' Capital   (0.38%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 19
% of Partners' Capital [4]   0.00%
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ (10,877)
% of Partners' Capital   (0.32%)
Open Commodity 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
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 4,606
% of Partners' Capital   0.14%
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2021 contracts, expiring January 2021    
Notional Amount $ 625,427  
Number of Contracts | contract 23  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (41,457)  
% of Partners' Capital (0.56%)  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG March 2021 contracts, expiring February 2021    
Notional Amount $ 595,284  
Number of Contracts | contract 23  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (14,304)  
% of Partners' Capital (0.19%)  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG April 2021 contracts, expiring March 2021    
Notional Amount $ 522,925  
Number of Contracts | contract 22  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 35,435  
% of Partners' Capital 0.48%  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG May 2021 contracts, expiring April 2021    
Notional Amount $ 568,664  
Number of Contracts | contract 23  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 18,986  
% of Partners' Capital 0.26%  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG June 2021 contracts, expiring May 2021    
Notional Amount $ 579,127  
Number of Contracts | contract 23  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 21,403  
% of Partners' Capital 0.29%  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG July 2021 contracts, expiring June 2021    
Notional Amount $ 589,700  
Number of Contracts | contract 23  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 27,850  
% of Partners' Capital 0.38%  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG August 2021 contracts, expiring July 2021    
Notional Amount $ 561,704  
Number of Contracts | contract 22  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 35,596  
% of Partners' Capital 0.48%  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG September 2021 contracts, expiring August 2021    
Notional Amount $ 618,613  
Number of Contracts | contract 23  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 5,147  
% of Partners' Capital 0.07%  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG October 2021 contracts, expiring September 2021    
Notional Amount $ 652,383  
Number of Contracts | contract 23  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (21,953)  
% of Partners' Capital (0.30%)  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG November 2021 contracts, expiring October 2021    
Notional Amount $ 649,795  
Number of Contracts | contract 22  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (34,675)  
% of Partners' Capital [4] (0.47%)  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG December 2021 contracts, expiring November 2021    
Notional Amount $ 713,702  
Number of Contracts | contract 23  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (43,712)  
% of Partners' Capital (0.59%)  
Open Commodity Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG January 2022 contracts, expiring December 2021    
Notional Amount $ 701,660  
Number of Contracts | contract 23  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (10,280)  
% of Partners' Capital (0.14%)  
Cash Equivalents [Member]    
Market Value   $ 3,289,117
% of Partners' Capital   97.49%
Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Market Value   $ 2,789,117
% of Partners' Capital   82.67%
Cash Equivalents [Member] | United States Money Market Funds [Member]    
Market Value   $ 500,000
% of Partners' Capital   14.82%
Cash Equivalents [Member] | United States Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS, 0.00% [Member]    
Principal Amount   $ 400,000
Market Value   $ 400,000
% of Partners' Capital   11.86%
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   2.96%
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] Reflects the 7-day yield at December 31, 2020.
[2] Collateral amounted to $845,621 on open commodity futures contracts.
[3] Collateral amounted to $803,973 on open futures contracts.
[4] Represents less than 0.005%.