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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) $ 1,721,955 $ 29,373,365 $ (27,954,946)
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 2,008,816 22,323,683 (9,535,467)
Unrealized (gain) loss on open futures contracts 6,205,208 (37,249,404) 2,875,569
(Increase) decrease in dividends receivable (5,975) (10,590) 436
(Increase) decrease in interest receivable (2,694) 0 0
(Increase) decrease in ETF transaction fees receivable 0 0 350
Increase (decrease) in payable due to Broker (7,547,510) 15,112,791 0
Increase (decrease) in General Partner management fees payable (17,694) 30,247 16,068
Increase (decrease) in professional fees payable 64,802 (73,070) (76,611)
Increase (decrease) in brokerage commissions payable 0 2,200 3,150
Increase (decrease) in directors' fees and insurance payable (425) 697 726
Increase (decrease) in license fees payable (2,320) 2,276 1,118
Net cash provided by (used in) operating activities 2,424,163 29,512,195 (34,669,607)
Cash Flows from Financing Activities:      
Addition of partnership shares 22,440,164 56,075,976 89,295,970
Redemption of partnership shares (58,996,025) (29,595,130) (26,710,614)
Net cash provided by (used in) financing activities (36,555,861) 26,480,846 62,585,356
Net Increase (Decrease) in Cash and Cash Equivalents (34,131,698) 55,993,041 27,915,749
Cash and Cash Equivalents, beginning of year 117,373,323 61,380,282 33,464,533
Cash and Cash Equivalents, end of year $ 83,241,625 $ 117,373,323 $ 61,380,282