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Condensed Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows from Operating Activities:
Net income (loss)	$ (132,888,937)	$ (662,758)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	8,450,660	(50,133,597)
(Increase) decrease in dividends receivable	37,980	53,997
(Increase) decrease in interest receivable	5,227	9,499
(Increase) decrease in prepaid insurance	(47,320)	8,204
(Increase) decrease in prepaid registration fees	68,250	25,390
(Increase) decrease in ETF transaction fees receivable	1,000	1,000
Increase (decrease) in General Partner management fees payable	(13,746)	(65,773)
Increase (decrease) in professional fees payable	(348,841)	(320,586)
Increase (decrease) in brokerage commissions payable	6,000	0
Increase (decrease) in directors' fees payable	3,326	(2,010)
Increase (decrease) in insurance payable	0	72
Increase (decrease) in license fees payable	3,599	(4,202)
Net cash provided by (used in) operating activities	(124,722,802)	(51,090,764)
Cash Flows from Financing Activities:
Addition of partnership shares	261,502,775	271,042,716
Redemption of partnership shares	(238,506,716)	(307,344,815)
Net cash provided by (used in) financing activities	22,996,059	(36,302,099)
Net Increase (Decrease) in Cash and Cash Equivalents	(101,726,743)	(87,392,863)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period	458,998,451	359,791,174
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period	$ 357,271,708	$ 272,398,311

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