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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash Flows from Operating Activities:    
Net income (loss) $ (2,018,371) $ 27,633,527
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 (5,148,590) 10,736,772
Unrealized (gain) loss on open futures contracts (73,620) (15,895,590)
(Increase) decrease in receivable from General Partner (60,583) (3,628)
(Increase) decrease in dividends receivable (4,000) (6,389)
(Increase) decrease in interest receivable (7,559) 0
(Increase) decrease in directors' fees and insurance receivable (404) 0
(Increase) decrease in ETF transaction fees receivable 350 0
Increase (decrease) in payable due to Broker 0 5,800,122
Increase (decrease) in General Partner management fees payable (13,754) 18,813
Increase (decrease) in professional fees payable 53,807 (55,868)
Increase (decrease) in brokerage commissions payable (1,860) 1,430
Increase (decrease) in directors' fees and insurance payable (1,184) (542)
Net cash provided by (used in) operating activities (7,275,768) 28,228,647
Cash Flows from Financing Activities:    
Addition of partnership shares 40,082,469 33,014,668
Redemption of partnership shares (53,128,704) (24,486,264)
Net cash provided by (used in) financing activities (13,046,235) 8,528,404
Net Increase (Decrease) in Cash and Cash Equivalents (20,322,003) 36,757,051
Cash and Cash Equivalents, beginning of period 103,167,056 67,996,295
Cash and Cash Equivalents, end of period $ 82,845,053 $ 104,753,346