Schedule of Investments - Futures Contracts		12 Months Ended
		Dec. 31, 2019 USD ($) Contract	Dec. 31, 2018 USD ($) Contract
Schedule of Investments [Line Items]
Commodity Futures Contracts, Value		$ 1,432,745,979	$ 2,009,510,843
Futures [Member] | Long [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Value	[1]	47,694,395	(243,800,174)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 47,694,395	$ (243,800,174)
Futures [Member] | Long [Member] | CBOT Corn [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		3,905	6,161
Commodity Futures Contracts, Expiration Date		Sep. 30, 2020	Sep. 30, 2019
Commodity Futures Contracts, Notional Value		$ 78,295,250	$ 121,217,675
Commodity Futures Contracts, Value	[1]	(3,026,104)	(4,115,659)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (3,026,104)	$ (4,115,659)
Futures [Member] | Long [Member] | CBOT Soybean [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		1,602	2,652
Commodity Futures Contracts, Expiration Date		Nov. 30, 2020	Nov. 30, 2019
Commodity Futures Contracts, Notional Value		$ 78,397,875	$ 124,014,150
Commodity Futures Contracts, Value	[1]	1,276,086	513,337
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 1,276,086	$ 513,337
Futures [Member] | Long [Member] | CBOT Wheat [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		2,954	4,579
Commodity Futures Contracts, Expiration Date		Jul. 31, 2020	Jul. 31, 2019
Commodity Futures Contracts, Notional Value		$ 83,228,950	$ 118,710,575
Commodity Futures Contracts, Value	[1]	3,287,335	(16,075,643)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 3,287,335	$ (16,075,643)
Futures [Member] | Long [Member] | CME SWAPS MARKETS (COMEX) Gold [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		749	1,425
Commodity Futures Contracts, Expiration Date		Feb. 29, 2020	Feb. 28, 2019
Commodity Futures Contracts, Notional Value		$ 114,080,190	$ 182,585,250
Commodity Futures Contracts, Value	[1]	14,071,689	4,757,025
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 14,071,689	$ 4,757,025
Futures [Member] | Long [Member] | CME SWAPS MARKETS (COMEX) Silver [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		323	600
Commodity Futures Contracts, Expiration Date		May 31, 2020	May 31, 2019
Commodity Futures Contracts, Notional Value		$ 29,084,535	$ 46,878,000
Commodity Futures Contracts, Value	[1]	3,636,158	2,594,092
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 3,636,158	$ 2,594,092
Futures [Member] | Long [Member] | ICE FUTURES EUROPE Brent Crude Oil [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		2,802	3,816
Commodity Futures Contracts, Expiration Date		Jan. 31, 2020	Nov. 30, 2019
Commodity Futures Contracts, Notional Value		$ 184,932,000	$ 210,834,000
Commodity Futures Contracts, Value	[1]	10,124,770	(61,104,242)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 10,124,770	$ (61,104,242)
Futures [Member] | Long [Member] | LME CLEAR Aluminum [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		1,259	1,791
Commodity Futures Contracts, Expiration Date		Apr. 30, 2020	Oct. 31, 2019
Commodity Futures Contracts, Notional Value		$ 57,111,388	$ 85,027,725
Commodity Futures Contracts, Value	[1]	1,559,850	(8,383,194)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 1,559,850	$ (8,383,194)
Futures [Member] | Long [Member] | LME CLEAR Copper [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		386	595
Commodity Futures Contracts, Expiration Date		Jun. 30, 2020	Feb. 28, 2019
Commodity Futures Contracts, Notional Value		$ 59,694,900	$ 88,770,281
Commodity Futures Contracts, Value	[1]	4,507,945	(14,524,306)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 4,507,945	$ (14,524,306)
Futures [Member] | Long [Member] | LME CLEAR Zinc [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		924	1,463
Commodity Futures Contracts, Expiration Date		Mar. 31, 2020	Mar. 31, 2019
Commodity Futures Contracts, Notional Value		$ 52,546,725	$ 90,358,537
Commodity Futures Contracts, Value	[1]	1,010,894	(4,169,375)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 1,010,894	$ (4,169,375)
Futures [Member] | Long [Member] | ICE FUTURES U.S. Sugar [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		5,329	8,266
Commodity Futures Contracts, Expiration Date		Sep. 30, 2020	Sep. 30, 2019
Commodity Futures Contracts, Notional Value		$ 82,842,502	$ 116,001,738
Commodity Futures Contracts, Value	[1]	7,476,859	(788,761)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 7,476,859	$ (788,761)
Futures [Member] | Long [Member] | CME SWAPS MARKETS (NYMEX) Natural Gas [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		3,161	4,463
Commodity Futures Contracts, Expiration Date		Apr. 30, 2020	Apr. 30, 2019
Commodity Futures Contracts, Notional Value		$ 69,162,680	$ 119,251,360
Commodity Futures Contracts, Value	[1]	(12,073,446)	1,564,207
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (12,073,446)	$ 1,564,207
Futures [Member] | Long [Member] | CME SWAPS MARKETS (NYMEX) NY Harbor ULSD [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		2,184	3,046
Commodity Futures Contracts, Expiration Date		May 31, 2020	May 31, 2019
Commodity Futures Contracts, Notional Value		$ 180,823,407	$ 212,725,330
Commodity Futures Contracts, Value	[1]	(4,811,899)	(57,894,130)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (4,811,899)	$ (57,894,130)
Futures [Member] | Long [Member] | CME SWAPS MARKETS (NYMEX) RBOB Gasoline [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		2,649	3,799
Commodity Futures Contracts, Expiration Date		Nov. 30, 2020	Dec. 31, 2019
Commodity Futures Contracts, Notional Value		$ 176,221,546	$ 212,993,974
Commodity Futures Contracts, Value	[1]	6,030,558	(26,605,722)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 6,030,558	$ (26,605,722)
Futures [Member] | Long [Member] | CME SWAPS MARKETS (NYMEX) WTI Crude Oil [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		3,000	4,437
Commodity Futures Contracts, Expiration Date		Feb. 29, 2020	Feb. 28, 2019
Commodity Futures Contracts, Notional Value		$ 182,310,000	$ 202,859,640
Commodity Futures Contracts, Value	[1]	14,623,700	(59,567,803)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 14,623,700	$ (59,567,803)

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