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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash Flows from Operating Activities:      
Net income (loss) $ 37,005,128 $ (43,645,160) $ (26,451,869)
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 12,434,314 (11,579,384) (5,881,741)
Unrealized (gain) loss on open futures contracts (9,775,220) 1,095,250 6,375,760
(Increase) decrease in receivable from General Partner (54,380) (41,001) (13,711)
(Increase) decrease in dividends receivable (10,339) (13) 558
(Increase) decrease in ETF transaction fees receivable 0 0 (350)
Increase (decrease) in General Partner management fees payable 25,134 27,097 4,068
Increase (decrease) in professional fees payable (5,790) (2,625) (24,606)
Increase (decrease) in brokerage commissions payable 1,430 4,060 865
Increase (decrease) in directors' fees and insurance payable 523 323 129
Net cash provided by (used in) operating activities 39,620,800 (54,141,453) (25,990,897)
Cash Flows from Financing Activities:      
Addition of partnership shares 41,041,049 124,538,212 75,499,118
Redemption of partnership shares (45,491,088) (38,808,966) (38,357,031)
Net cash provided by (used in) financing activities (4,450,039) 85,729,246 37,142,087
Net Increase (Decrease) in Cash and Cash Equivalents 35,170,761 31,587,793 11,151,190
Cash and Cash Equivalents, beginning of year 67,996,295 36,408,502 25,257,312
Cash and Cash Equivalents, end of year $ 103,167,056 $ 67,996,295 $ 36,408,502