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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash Flows from Operating Activities:    
Net income (loss) $ 18,181,911 $ (15,789,632)
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 21,326,377 (1,277,897)
Unrealized (gain) loss on open futures contracts (30,005,207) (4,104,681)
(Increase) decrease in dividends receivable (8,301) 274
(Increase) decrease in ETF transaction fees receivable 0 350
Increase (decrease) in payable due to Broker 7,411,179 0
Increase (decrease) in General Partner management fees payable 21,793 17,008
Increase (decrease) in professional fees payable (91,883) (85,521)
Increase (decrease) in brokerage commissions payable 2,200 3,150
Increase (decrease) in directors' fees and insurance payable (308) 71
Increase (decrease) in license fees payable 2,046 1,205
Net cash provided by (used in) operating activities 16,839,807 (21,235,673)
Cash Flows from Financing Activities:    
Addition of partnership shares 49,890,042 74,914,452
Redemption of partnership shares (15,767,127) (24,486,814)
Net cash provided by (used in) financing activities 34,122,915 50,427,638
Net Increase (Decrease) in Cash and Cash Equivalents 50,962,722 29,191,965
Cash and Cash Equivalents, beginning of period 61,380,282 33,464,533
Cash and Cash Equivalents, end of period $ 112,343,004 $ 62,656,498