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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash Flows from Operating Activities:    
Net income (loss) $ (11,209,791) $ 18,181,911
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
(Increase) decrease in commodity futures trading account - cash and cash equivalents (12,617,622) 21,326,377
Unrealized (gain) loss on open futures contracts 17,358,999 (30,005,207)
(Increase) decrease in dividends receivable (5,522) (8,301)
(Increase) decrease in interest receivable (9,844) 0
(Increase) decrease in directors' fees and insurance receivable (353) 0
(Increase) decrease in ETF transaction fees receivable (350) 0
Increase (decrease) in payable due to Broker (15,112,791) 7,411,179
Increase (decrease) in General Partner management fees payable (10,015) 21,793
Increase (decrease) in professional fees payable (7,658) (91,883)
Increase (decrease) in brokerage commissions payable 0 2,200
Increase (decrease) in directors' fees and insurance payable (1,439) (308)
Increase (decrease) in license fees payable (1,747) 2,046
Net cash provided by (used in) operating activities (21,618,133) 16,839,807
Cash Flows from Financing Activities:    
Addition of partnership shares 22,440,164 49,890,042
Redemption of partnership shares (28,660,434) (15,767,127)
Net cash provided by (used in) financing activities (6,220,270) 34,122,915
Net Increase (Decrease) in Cash and Cash Equivalents (27,838,403) 50,962,722
Cash and Cash Equivalents, beginning of period 117,373,323 61,380,282
Cash and Cash Equivalents, end of period $ 89,534,920 $ 112,343,004