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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) $ 29,373,365 $ (27,954,946) $ (18,806,073)
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 22,323,683 (9,535,467) (16,237,347)
Unrealized (gain) loss on open futures contracts (37,249,404) 2,875,569 18,738,510
(Increase) decrease in dividends receivable (10,590) 436 578
(Increase) decrease in ETF transaction fees receivable 0 350 0
Increase (decrease) in payable due to Broker 15,112,791 0 0
Increase (decrease) in General Partner management fees payable 30,247 16,068 (14,893)
Increase (decrease) in professional fees payable (73,070) (76,611) (61,346)
Increase (decrease) in brokerage commissions payable 2,200 3,150 (200)
Increase (decrease) in directors' fees and insurance payable 697 726 (1,046)
Increase (decrease) in license fees payable 2,276 1,118 (1,075)
Increase (decrease) in registration fees payable 0 0 (153)
Net cash provided by (used in) operating activities 29,512,195 (34,669,607) (16,383,045)
Cash Flows from Financing Activities:      
Addition of partnership shares 56,075,976 89,295,970 5,507,498
Redemption of partnership shares (29,595,130) (26,710,614) (15,044,128)
Net cash provided by (used in) financing activities 26,480,846 62,585,356 (9,536,630)
Net Increase (Decrease) in Cash and Cash Equivalents 55,993,041 27,915,749 (25,919,675)
Cash and Cash Equivalents, beginning of year 61,380,282 33,464,533 59,384,208
Cash and Cash Equivalents, end of year $ 117,373,323 $ 61,380,282 $ 33,464,533