Schedule of Investments (Unaudited) - Futures Contracts		3 Months Ended	12 Months Ended
		Mar. 31, 2021 USD ($) Contract	Dec. 31, 2020 USD ($) Contract
Schedule Of Investments [Line Items]
Commodity Futures Contracts, Value		$ 238,418,827	$ 135,737,610
Futures [Member] | Long [Member]
Schedule Of Investments [Line Items]
Commodity Futures Contracts, Value	[1]	51,673,736	34,730,897
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 51,673,736	$ 34,730,897
Futures [Member] | Long [Member] | LME Aluminum [Member]
Schedule Of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		1,767	1,138
Commodity Futures Contracts, Expiration Date		May 31, 2021	May 31, 2021
Commodity Futures Contracts, Notional Value		$ 97,196,044	$ 56,508,813
Commodity Futures Contracts, Value	[1]	15,798,347	8,814,677
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 15,798,347	$ 8,814,677
Futures [Member] | Long [Member] | LME Copper [Member]
Schedule Of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		486	313
Commodity Futures Contracts, Expiration Date		May 31, 2021	May 31, 2021
Commodity Futures Contracts, Notional Value		$ 106,786,350	$ 60,794,381
Commodity Futures Contracts, Value	[1]	23,879,459	15,332,202
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 23,879,459	$ 15,332,202
Futures [Member] | Long [Member] | LME Zinc [Member]
Schedule Of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		1,266	816
Commodity Futures Contracts, Expiration Date		Aug. 31, 2021	Aug. 31, 2021
Commodity Futures Contracts, Notional Value		$ 89,427,075	$ 56,484,132
Commodity Futures Contracts, Value	[1]	11,995,930	10,584,018
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 11,995,930	$ 10,584,018

[1] Unrealized Appreciation (Depreciation) and Value are presented above, net by contract.