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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) $ 27,633,527 $ (19,958,712)
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 10,736,772 (5,775,280)
Unrealized (gain) loss on open futures contracts (15,895,590) (1,982,630)
(Increase) decrease in receivable from General Partner (3,628) 2,990
(Increase) decrease in dividends receivable (6,389) (8)
(Increase) decrease in ETF transaction fees receivable 0 350
Increase (decrease) in payable due to Broker 5,800,122 0
Increase (decrease) in General Partner management fees payable 18,813 32,335
Increase (decrease) in professional fees payable (55,868) (27,517)
Increase (decrease) in brokerage commissions payable 1,430 4,060
Increase (decrease) in directors' fees and insurance payable (542) (187)
Net cash provided by (used in) operating activities 28,228,647 (27,704,599)
Cash Flows from Financing Activities:    
Addition of partnership shares 33,014,668 99,919,258
Redemption of partnership shares (24,486,264) (36,340,445)
Net cash provided by (used in) financing activities 8,528,404 63,578,813
Net Increase (Decrease) in Cash and Cash Equivalents 36,757,051 35,874,214
Cash and Cash Equivalents, beginning of period 67,996,295 36,408,502
Cash and Cash Equivalents, end of period $ 104,753,346 $ 72,282,716