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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) $ 9,331,563 $ 1,510,602
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 (3,971,270) (16,299,361)
Unrealized (gain) loss on open commodity futures contracts (4,469,818) (1,670,430)
(Increase) decrease in receivable from General Partner 35,875 22,948
(Increase) decrease in dividends receivable (303) 427
(Increase) decrease in directors' fees and insurance receivable (270) (1,204)
(Increase) decrease in ETF transaction fees receivable 350 350
Increase (decrease) in General Partner management fees payable 42,723 12,366
Increase (decrease) in professional fees payable (56,750) (58,630)
Increase (decrease) in brokerage commissions payable 2,860 465
Increase (decrease) in directors' fees and insurance payable (338) (209)
Net cash provided by (used in) operating activities 914,622 (16,482,676)
Cash Flows from Financing Activities:    
Addition of partnership shares 78,769,140 41,667,775
Redemption of partnership shares (22,040,890) (17,231,840)
Net cash provided by (used in) financing activities 56,728,250 24,435,935
Net Increase (Decrease) in Cash and Cash Equivalents 57,642,872 7,953,259
Cash and Cash Equivalents, beginning of period 36,408,502 25,257,312
Cash and Cash Equivalents, end of period $ 94,051,374 $ 33,210,571