XML 45 R30.htm IDEA: XBRL DOCUMENT v3.21.2
Derivative Instruments - Fair Value of Derivative Instruments (Detail) - Commodity Futures Contract [Member] - Not Designated as Hedging Instrument [Member] - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Derivatives Fair Value [Line Items]    
Assets   $ 28,341,350
Liabilities $ (7,351,216)