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Schedule of Investments
 12 Months Ended
Dec. 31, 2024
USD ($)
contract
Dec. 31, 2023
USD ($)
Notional Amount $ 218,659,990 [1] $ 223,865,330 [2]
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts 80,696,279 40,072,461
Market Value   $ 70,950,000
% of Partners' Capital   7.29%
Fair Value/Open Commodity Swap Contracts 218,657,785 [1] $ 238,768,541 [2]
Unrealized Gain (Loss) on Commodity Swap Contracts $ (2,205) [1],[3] $ 14,903,211 [2],[4]
MACQUARIE MQCP362H 12122023 Index | Macquarie Bank Ltd.    
Payment Frequency [5]   Monthly
Expiration Date [5]   Jan. 12, 2024
Notional Amount [5]   $ 129,306,126
Number of Contracts [5]   0.0025
Fair Value/Open Commodity Swap Contracts [5]   $ 144,210,360
Unrealized Gain (Loss) on Commodity Swap Contracts [4],[5]   $ 14,904,234
SOC GEN SGIXCNG1 09292023 Index | Societe Generale    
Payment Frequency [5]   Monthly
Expiration Date [5]   Mar. 29, 2024
Notional Amount [5]   $ 94,559,204
Number of Contracts [5]   0.004
Fair Value/Open Commodity Swap Contracts [5]   $ 94,558,181
Unrealized Gain (Loss) on Commodity Swap Contracts [4],[5]   (1,023)
Scotia SNOVNG 108202024 Index    
Payment Frequency [5] monthly  
Expiration Date [5] Feb. 28, 2025  
Notional Amount [5] $ 107,293,519  
Number of Contracts [5] 0.0017  
Fair Value/Open Commodity Swap Contracts [5] $ 107,292,519  
Unrealized Gain (Loss) on Commodity Swap Contracts [3],[5] $ (1,000)  
SOC GEN SGIXCNG 109272024 Index    
Payment Frequency [5] monthly  
Expiration Date [5] Mar. 27, 2025  
Notional Amount [5] $ 111,366,471  
Number of Contracts [5] 0.004  
Fair Value/Open Commodity Swap Contracts [5] $ 111,365,266  
Unrealized Gain (Loss) on Commodity Swap Contracts [3],[5] $ (1,205)  
NYMEX Natural Gas August 2023 contracts, expiring July 2023    
Number of Contracts | contract 14,459  
Open Commodity Futures Contracts - Long | United States | NYMEX Natural Gas Futures NG February 2025 contracts, expiring January 2025    
Notional Amount [6] $ 444,599,191  
Number of Contracts | contract [6] 14,459  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts [6] $ 80,696,279  
% of Partners' Capital [6] 10.85%  
Open Commodity Futures Contracts - Long | United States | NYMEX Natural Gas Futures NG February 2024 contracts, expiring January 2024    
Notional Amount [7]   $ 695,222,259
Number of Contracts [7]   29,248
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts [7]   $ 40,072,461
% of Partners' Capital [7]   4.11%
Cash Equivalents | United States    
Market Value $ 532,370,156  
% of Partners' Capital 71.57%  
Cash Equivalents | United States | US Treasury Securities | U.S. Treasury Bills 4.39%, 2/27/2025    
Shares/Principal Amount $ 11,500,000  
Market Value $ 11,420,156  
% of Partners' Capital 1.54%  
Cash Equivalents | United States | Money Market Funds    
Market Value $ 520,950,000  
% of Partners' Capital 70.04%  
Cash Equivalents | United States | Money Market Funds | Morgan Stanley Institutional Liquidity Funds - Government Portfolio - Institutional Shares, 5.27%    
Shares/Principal Amount [8]   $ 70,950,000
Market Value [8]   $ 70,950,000
% of Partners' Capital [8]   7.29%
Cash Equivalents | United States | Money Market Funds | Morgan Stanley Institutional Liquidity Funds - Government Portfolio - Institutional Shares    
Shares/Principal Amount [9] $ 520,950,000  
Market Value [9] $ 520,950,000  
% of Partners' Capital [9] 70.04%  
[1] Collateral amounted to $37,100,156 on open OTC commodity swap contracts.
[2] Collateral amounted to $40,660,000 on open OTC commodity swap contracts.
[3] Reflects the value at reset date of December 31, 2024.
[4] Reflects the value at reset date of December 29, 2023.
[5] Custom index comprised of a basket of underlying instruments.
[6] Collateral amounted to $46,487,832 on open commodity futures contracts.
[7] Collateral amounted to $210,148,873 on open commodity futures contracts.
[8] Reflects the 7-day yield at December 31, 2023.
[9] Reflects the 7-day yield at December 31, 2024.