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Condensed Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ (662,758)	$ 11,097,621
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	(50,133,597)	56,078,080
(Increase) decrease in dividends receivable	53,997	(7,536)
(Increase) decrease in interest receivable	9,499	6,859
(Increase) decrease in prepaid registration fees	25,390	39,269
(Increase) decrease in ETF transaction fees receivable	1,000	1,000
Increase (decrease) in General Partner management fees payable	(65,773)	(154,484)
Increase (decrease) in professional fees payable	(320,586)	(172,763)
Increase (decrease) in brokerage commissions payable	0	(12,500)
Increase (decrease) in directors' fees and insurance payable	6,266	2,337
Increase (decrease) in license fees payable	(4,202)	(5,578)
Net cash provided by (used in) operating activities	(51,090,764)	66,872,305
Cash Flows from Financing Activities:
Addition of partnership shares	271,042,716	463,303,459
Redemption of partnership shares	(307,344,815)	(813,825,999)
Net cash provided by (used in) financing activities	(36,302,099)	(350,522,540)
Net Increase (Decrease) in Cash and Cash Equivalents	(87,392,863)	(283,650,235)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period	359,791,174	651,938,294
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period	$ 272,398,311	$ 368,288,059

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