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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) $ (27,954,946) $ (18,806,073) $ 5,578,244
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 (9,535,467) (16,237,347) 7,985,297
Unrealized (gain) loss on open futures contracts 2,875,569 18,738,510 (85,540)
(Increase) decrease in dividends receivable 436 578 1,451
(Increase) decrease in prepaid registration fees 0 0 81,536
(Increase) decrease in ETF transaction fees receivable 350 0 (350)
Increase (decrease) in General Partner management fees payable 16,068 (14,893) (17,031)
Increase (decrease) in professional fees payable (76,611) (61,346) (11,128)
Increase (decrease) in brokerage commissions payable 3,150 (200) (1,430)
Increase (decrease) in directors' fees and insurance payable 726 (1,046) 79
Increase (decrease) in license fees payable 1,118 (1,075) (1,227)
Increase (decrease) in registration fees payable 0 (153) 0
Net cash provided by (used in) operating activities (34,669,607) (16,383,045) 13,529,901
Cash Flows from Financing Activities:      
Addition of partnership shares 89,295,970 5,507,498 26,960,147
Redemption of partnership shares (26,710,614) (15,044,128) (67,814,283)
Net cash provided by (used in) financing activities 62,585,356 (9,536,630) (40,854,136)
Net Increase (Decrease) in Cash and Cash Equivalents 27,915,749 (25,919,675) (27,324,235)
Cash and Cash Equivalents, beginning of year 33,464,533 59,384,208 86,708,443
Cash and Cash Equivalents, end of year $ 61,380,282 $ 33,464,533 $ 59,384,208