Statements of Income and Expenses - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income
Interest Income	$ 28,685,735	$ 41,701,196	$ 14,035,908
Dividends from Affiliates	7,639,423	6,595,643	2,600,473
Total Income	36,325,158	48,296,839	16,636,381
Expenses
Management Fees	13,741,915	22,341,142	17,965,282
Brokerage Commissions and Fees	393,428	574,590	492,416
Interest Expense	312,961	782,292	68,451
Total Expenses	14,448,304	23,698,024	18,526,149
Less: Waivers	(395,320)	(452,247)	(432,451)
Net Expenses	14,052,984	23,245,777	18,093,698
Net Investment Income (Loss)	22,272,174	25,051,062	(1,457,317)
Net Realized Gain (Loss) on
United States Treasury Obligations	54,902	(44,353)	(44,293)
Affiliated Investments	35,871
Commodity Futures Contracts	(108,439,638)	43,624,801	58,338,714
Net Realized Gain (Loss)	(108,348,865)	43,580,448	58,294,421
Net Change in Unrealized Gain (Loss) on
United States Treasury Obligations	301,796	46,869	(40,787)
Affiliated Investments	237,240	403,308	(247,678)
Commodity Futures Contracts	291,494,569	(359,469,489)	14,636,898
Net Change in Unrealized Gain (Loss)	292,033,605	(359,019,312)	14,348,433
Net Realized and Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	183,684,740	(315,438,864)	72,642,854
Net Income (Loss)	$ 205,956,914	$ (290,387,802)	$ 71,185,537