Statements of Income and Expenses (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income
Interest Income	$ 9,194,637	$ 7,586,315
Dividends from Affiliates	2,018,009	426,638
Total Income	11,212,646	8,012,953
Expenses
Management Fees	3,969,916	5,301,935
Brokerage Commissions and Fees	96,344	185,990
Interest Expense	214,655	6,778
Total Expenses	4,280,915	5,494,703
Less: Waivers	(98,734)	(112,573)
Net Expenses	4,182,181	5,382,130
Net Investment Income (Loss)	7,030,465	2,630,823
Net Realized Gain (Loss) on
United States Treasury Obligations	(20,868)	4,429
Commodity Futures Contracts	(38,427,269)	58,019,993
Net Realized Gain (Loss)	(38,448,137)	58,024,422
Net Change in Unrealized Gain (Loss) on
United States Treasury Obligations	117,402	(343,649)
Affiliated Investments	118,620	972,684
Commodity Futures Contracts	223,972,176	(20,518,651)
Net Change in Unrealized Gain (Loss)	224,208,198	(19,889,616)
Net Realized and Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	185,760,061	38,134,806
Net Income (Loss)	$ 192,790,526	$ 40,765,629