Statement of Changes in Shareholders' Equity (Unaudited) - USD ($)	Total	General Shares [Member]	Shares [Member]
Balance - Value at Dec. 31, 2018	$ 160,559,793	$ 618	$ 160,559,175
Balance - Shares at Dec. 31, 2018		40	10,400,000
Purchases of Shares - Value	26,281,459		$ 26,281,459
Purchases of Shares - Shares			1,600,000
Redemption of Shares - Value	(23,007,147)		$ (23,007,147)
Redemption of Shares - Shares			(1,400,000)
Net Increase (Decrease) due to Share Transactions, value	3,274,312		$ 3,274,312
Net Increase (Decrease) due to Share Transactions, shares			200,000
Net Income (Loss)
Net Investment Income (Loss)	610,121	$ 2	$ 610,119
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(5,101,990)	(19)	(5,101,971)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	21,472,438	81	21,472,357
Net Income (Loss)	16,980,569	64	16,980,505
Net Change in Shareholders' Equity, value	20,254,881	64	$ 20,254,817
Net Change in Shareholders' Equity, shares			200,000
Balance - Value at Mar. 31, 2019	180,814,674	$ 682	$ 180,813,992
Balance - Shares at Mar. 31, 2019		40	10,600,000
Balance - Value at Dec. 31, 2019	116,953,198	$ 600	$ 116,952,598
Balance - Shares at Dec. 31, 2019		40	7,800,000
Purchases of Shares - Value	12,134,870		$ 12,134,870
Purchases of Shares - Shares			800,000
Redemption of Shares - Value	(24,766,771)		$ (24,766,771)
Redemption of Shares - Shares			(1,800,000)
Net Increase (Decrease) due to Share Transactions, value	(12,631,901)		$ (12,631,901)
Net Increase (Decrease) due to Share Transactions, shares			(1,000,000)
Net Income (Loss)
Net Investment Income (Loss)	224,024	$ 1	$ 224,023
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(3,245,313)	(17)	(3,245,296)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(16,988,095)	(88)	(16,988,007)
Net Income (Loss)	(20,009,384)	(104)	(20,009,280)
Net Change in Shareholders' Equity, value	(32,641,285)	(104)	$ (32,641,181)
Net Change in Shareholders' Equity, shares			(1,000,000)
Balance - Value at Mar. 31, 2020	$ 84,311,913	$ 496	$ 84,311,417
Balance - Shares at Mar. 31, 2020		40	6,800,000