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Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
United States Treasury Obligations $ 97,990,729 $ 77,740,351
Money Market Mutual Fund 44,464,517 63,714,072
Total Investments in Securities 142,455,246 141,454,423
Commodity Futures Contracts, Appreciation 272,634  
Commodity Futures Contracts, Depreciation (3,086,169)  
Commodity Futures Contracts (2,813,535) 14,607,615
Total Investments 139,641,711 156,062,038
Commodity Futures Contracts (2,813,535) 14,607,615
Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Money Market Mutual Fund 44,464,517 63,714,072
Total Investments in Securities 44,464,517 63,714,072
Commodity Futures Contracts, Appreciation 272,634  
Commodity Futures Contracts, Depreciation (3,086,169)  
Commodity Futures Contracts (2,813,535) 14,607,615
Total Investments 41,650,982 78,321,687
Commodity Futures Contracts (2,813,535) 14,607,615
Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
United States Treasury Obligations 97,990,729 77,740,351
Total Investments in Securities 97,990,729 77,740,351
Total Investments $ 97,990,729 $ 77,740,351