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Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flows from Operating Activities:    
Net income (loss) $ 1,353,809 $ (5,217,256)
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 7,504,543 (1,821,701)
Unrealized (gain) loss on open futures contracts (10,861,510) (1,240,277)
(Increase) decrease in dividends receivable (2,259) 28
(Increase) decrease in directors' fees and insurance receivable (1,872) (1,659)
(Increase) decrease in ETF transaction fees receivable 0 350
Increase (decrease) in General Partner management fees payable 21,427 19,520
Increase (decrease) in professional fees payable (73,667) (100,760)
Increase (decrease) in brokerage commissions payable 2,200 2,250
Increase (decrease) in directors' fees and insurance payable (742) (16)
Increase (decrease) in license fees payable 965 787
Net cash provided by (used in) operating activities (2,057,106) (8,358,734)
Cash Flows from Financing Activities:    
Addition of partnership shares 39,299,030 41,194,167
Net cash provided by (used in) financing activities 39,299,030 41,194,167
Net Increase (Decrease) in Cash and Cash Equivalents 37,241,924 32,835,433
Cash and Cash Equivalents, beginning of period 61,380,282 33,464,533
Cash and Cash Equivalents, end of period $ 98,622,206 $ 66,299,966