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Schedule of Investments
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 1,362,413 $ (14,454,899)
Money Market Funds [Member]    
Market Value $ 243,443,000 $ 21,143,000
% of Partners' Capital 65.52% 5.10%
Money Market Funds [Member] | Fidelity Investments Money Market Funds Government Portfolio [Member]    
Shares/Principal Amount [1]   $ 1,103,000
Market Value [1]   $ 1,103,000
% of Partners' Capital [1]   0.27%
Open Commodity Futures Contracts, Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2021 contracts, expiring January 2021 [Member]    
Notional Amount [2]   $ 429,022,819
Number of Contracts [2]   16,328
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts [2]   $ (14,454,899)
% of Partners' Capital [2]   (3.49%)
Open Commodity Futures Contracts, Long [Member] | United States [Member] | Nymex Natural Gas Futures Ng February 2022 Contracts Expiring January 2022 Member    
Notional Amount [3] $ 370,182,887  
Number of Contracts [3] 9,961  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts [3] $ 1,362,413  
% of Partners' Capital [3] 0.37%  
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Government Fund Institutional Shares [Member]    
Shares/Principal Amount [4] $ 23,103,000  
Market Value [4] $ 23,103,000  
% of Partners' Capital [4] 6.22%  
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds Government Portfolio Institutional Shares [Member]    
Shares/Principal Amount [4] $ 163,800,000  
Market Value [4] $ 163,800,000  
% of Partners' Capital [4] 44.08%  
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | RBC U.S. Government Money Market Fund - Institutional Share Class [Member]    
Shares/Principal Amount $ 56,540,000 [4] $ 20,040,000 [1]
Market Value $ 56,540,000 [4] $ 20,040,000 [1]
% of Partners' Capital 15.22% [4] 4.83% [1]
[1] #   Reflects the 7-day yield at December 31, 2020.
[2] *   Collateral amounted to $97,539,600 on open commodity futures contracts.
[3] *   Collateral amounted to $127,265,650 on open commodity futures contracts.
[4] #   Reflects the 7-day yield at December 31, 2021.