Statement of Changes in Shareholders' Equity (Unaudited) - USD ($)	Total	General Shares [Member]	Shares [Member]
Balance - Value at Dec. 31, 2019	$ 141,736,392	$ 1,668	$ 141,734,724
Balance - Shares at Dec. 31, 2019		40	3,400,000
Purchases of Shares - Value	41,508,133		$ 41,508,133
Purchases of Shares - Shares			1,000,000
Redemption of Shares - Value	(58,263,422)		$ (58,263,422)
Redemption of Shares - Shares			(1,400,000)
Net Increase (Decrease) due to Share Transactions, value	(16,755,289)		$ (16,755,289)
Net Increase (Decrease) due to Share Transactions, shares			(400,000)
Net Income (Loss)
Net Investment Income (Loss)	122,752	$ 2	$ 122,750
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	13,026,223	172	13,026,051
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	5,588,443	74	5,588,369
Net Income (Loss)	18,737,418	248	18,737,170
Net Change in Shareholders' Equity, value	1,982,129	248	$ 1,981,881
Net Change in Shareholders' Equity, shares			(400,000)
Balance - Value at Jun. 30, 2020	143,718,521	$ 1,916	$ 143,716,605
Balance - Shares at Jun. 30, 2020		40	3,000,000
Balance - Value at Mar. 31, 2020	139,078,599	$ 1,636	$ 139,076,963
Balance - Shares at Mar. 31, 2020		40	3,400,000
Redemption of Shares - Value	(17,617,701)		$ (17,617,701)
Redemption of Shares - Shares			(400,000)
Net Increase (Decrease) due to Share Transactions, value	(17,617,701)		$ (17,617,701)
Net Increase (Decrease) due to Share Transactions, shares			(400,000)
Net Income (Loss)
Net Investment Income (Loss)	(146,149)		$ (146,149)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(605,640)	$ 48	(605,688)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	23,009,412	232	23,009,180
Net Income (Loss)	22,257,623	280	22,257,343
Net Change in Shareholders' Equity, value	4,639,922	280	$ 4,639,642
Net Change in Shareholders' Equity, shares			(400,000)
Balance - Value at Jun. 30, 2020	143,718,521	$ 1,916	$ 143,716,605
Balance - Shares at Jun. 30, 2020		40	3,000,000
Balance - Value at Dec. 31, 2020	141,887,621	$ 2,102	$ 141,885,519
Balance - Shares at Dec. 31, 2020		40	2,700,000
Purchases of Shares - Value	10,169,577		$ 10,169,577
Purchases of Shares - Shares			200,000
Redemption of Shares - Value	(19,955,157)		$ (19,955,157)
Redemption of Shares - Shares			(400,000)
Net Increase (Decrease) due to Share Transactions, value	(9,785,580)		$ (9,785,580)
Net Increase (Decrease) due to Share Transactions, shares			(200,000)
Net Income (Loss)
Net Investment Income (Loss)	(422,887)	$ (6)	$ (422,881)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	27,223,629	401	27,223,228
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(35,695,791)	(526)	(35,695,265)
Net Income (Loss)	(8,895,049)	(131)	(8,894,918)
Net Change in Shareholders' Equity, value	(18,680,629)	(131)	$ (18,680,498)
Net Change in Shareholders' Equity, shares			(200,000)
Balance - Value at Jun. 30, 2021	123,206,992	$ 1,971	$ 123,205,021
Balance - Shares at Jun. 30, 2021		40	2,500,000
Balance - Value at Mar. 31, 2021	114,013,273	$ 1,900	$ 114,011,373
Balance - Shares at Mar. 31, 2021		40	2,400,000
Purchases of Shares - Value	10,169,577		$ 10,169,577
Purchases of Shares - Shares			200,000
Redemption of Shares - Value	(4,956,617)		$ (4,956,617)
Redemption of Shares - Shares			(100,000)
Net Increase (Decrease) due to Share Transactions, value	5,212,960		$ 5,212,960
Net Increase (Decrease) due to Share Transactions, shares			100,000
Net Income (Loss)
Net Investment Income (Loss)	(216,414)	$ (3)	$ (216,411)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	10,751,584	143	10,751,441
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(6,554,411)	(69)	(6,554,342)
Net Income (Loss)	3,980,759	71	3,980,688
Net Change in Shareholders' Equity, value	9,193,719	71	$ 9,193,648
Net Change in Shareholders' Equity, shares			100,000
Balance - Value at Jun. 30, 2021	$ 123,206,992	$ 1,971	$ 123,205,021
Balance - Shares at Jun. 30, 2021		40	2,500,000