Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	$ 5,999,443	$ 11,998,090
Money Market Mutual Fund	12,944,971	13,839,876
Total Investments in Securities	18,944,414	25,837,966
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	786,770	7,522,894
Total Investments	19,731,184	33,360,860
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Mutual Fund	12,944,971	13,839,876
Total Investments in Securities	12,944,971	13,839,876
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	786,770	7,522,894
Total Investments	13,731,741	21,362,770
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	5,999,443	11,998,090
Total Investments in Securities	5,999,443	11,998,090
Total Investments	$ 5,999,443	$ 11,998,090