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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash Flows from Operating Activities:    
Net income (loss) $ (15,789,632) $ (1,136,302)
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 (1,277,897) 1,144,502
Unrealized (gain) loss on open futures contracts (4,104,681) 3,251,600
(Increase) decrease in dividends receivable 274 389
(Increase) decrease in directors' fees and insurance receivable 0 (1,532)
(Increase) decrease in ETF transaction fees receivable 350 350
Increase (decrease) in investment payable 0 (2,141,524)
Increase (decrease) in General Partner management fees payable 17,008 (7,641)
Increase (decrease) in professional fees payable (85,521) (82,690)
Increase (decrease) in brokerage commissions payable 3,150 0
Increase (decrease) in directors' fees and insurance payable 71 (1,062)
Increase (decrease) in license fees payable 1,205 (569)
Increase (decrease) in registration fees payable 0 (153)
Net cash provided by (used in) operating activities (21,235,673) 1,025,368
Cash Flows from Financing Activities:    
Addition of partnership shares 74,914,452 0
Redemption of partnership shares (24,486,814) (12,902,604)
Net cash provided by (used in) financing activities 50,427,638 (12,902,604)
Net Increase (Decrease) in Cash and Cash Equivalents 29,191,965 (11,877,236)
Cash and Cash Equivalents, beginning of period 33,464,533 59,384,208
Cash and Cash Equivalents, end of period $ 62,656,498 $ 47,506,972