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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities:      
Net income (loss) $ 15,451,090 $ 37,005,128 $ (43,645,160)
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 (5,869,595) 12,434,314 (11,579,384)
Unrealized (gain) loss on open futures contracts (3,255,030) (9,775,220) 1,095,250
(Increase) decrease in receivable from General Partner (141,688) (54,380) (41,001)
(Increase) decrease in dividends receivable (6,613) (10,339) (13)
(Increase) decrease in interest receivable (9,575) 0 0
(Increase) decrease in ETF transaction fees receivable 350 0 0
Increase (decrease) in General Partner management fees payable (12,926) 25,134 27,097
Increase (decrease) in professional fees payable 135,701 (5,790) (2,625)
Increase (decrease) in brokerage commissions payable (1,860) 1,430 4,060
Increase (decrease) in directors' fees and insurance payable (56) 523 323
Net cash provided by (used in) operating activities 6,289,798 39,620,800 (54,141,453)
Cash Flows from Financing Activities:      
Addition of partnership shares 40,082,469 41,041,049 124,538,212
Redemption of partnership shares (71,195,236) (45,491,088) (38,808,966)
Net cash provided by (used in) financing activities (31,112,767) (4,450,039) 85,729,246
Net Increase (Decrease) in Cash and Cash Equivalents (24,822,969) 35,170,761 31,587,793
Cash and Cash Equivalents, beginning of year 103,167,056 67,996,295 36,408,502
Cash and Cash Equivalents, end of year $ 78,344,087 $ 103,167,056 $ 67,996,295