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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash Flows from Operating Activities:    
Net income (loss) $ 3,496,534 $ 5,404,017
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 11,328,128 2,947,027
Unrealized (gain) loss on futures contracts (15,811,271) (3,632,210)
(Increase) decrease in dividends receivable 49 389
(Increase) decrease in directors' fees and insurance receivable (572) (3,152)
(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 22,189 (4,221)
Increase (decrease) in professional fees payable (99,564) (102,996)
Increase (decrease) in brokerage commissions payable 2,250 0
Increase (decrease) in directors' fees and insurance payable (16) (1,062)
Increase (decrease) in license fees payable 1,658 (462)
Increase (decrease) in registration fees payable 0 (153)
Net cash provided by (used in) operating activities (1,060,265) 2,466,003
Cash Flows from Financing Activities:    
Addition of partnership shares 54,849,658 0
Redemption of partnership shares (13,733,080) (8,547,205)
Net cash provided by (used in) financing activities 41,116,578 (8,547,205)
Net Increase (Decrease) in Cash and Cash Equivalents 40,056,313 (6,081,202)
Cash and Cash Equivalents, beginning of period 33,464,533 59,384,208
Cash and Cash Equivalents, end of period $ 73,520,846 $ 53,303,006