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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Flows from Operating Activities:      
Net income (loss) $ (43,645,160) $ (26,451,869) $ 2,260,564
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 (11,579,384) (5,881,741) 1,663,093
Unrealized (gain) loss on open futures contracts 1,095,250 6,375,760 710,660
(Increase) decrease in receivable from General Partner (41,001) (13,711) (33,405)
(Increase) decrease in dividends receivable (13) 558 452
(Increase) decrease in ETF transaction fees receivable 0 (350) (350)
Increase (decrease) in General Partner management fees payable 27,097 4,068 (10,163)
Increase (decrease) in professional fees payable (2,625) (24,606) 15,103
Increase (decrease) in brokerage commissions payable 4,060 865 (400)
Increase (decrease) in directors' fees and insurance payable 323 129 (73)
Net cash provided by (used in) operating activities (54,141,453) (25,990,897) 4,605,481
Cash Flows from Financing Activities:      
Addition of partnership shares 124,538,212 75,499,118 118,483,039
Redemption of partnership shares (38,808,966) (38,357,031) (137,337,227)
Net cash provided by (used in) financing activities 85,729,246 37,142,087 (18,854,188)
Net Increase (Decrease) in Cash and Cash Equivalents 31,587,793 11,151,190 (14,248,707)
Cash and Cash Equivalents, beginning of year 36,408,502 25,257,312 39,506,019
Cash and Cash Equivalents, end of year $ 67,996,295 $ 36,408,502 $ 25,257,312