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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash Flows from Operating Activities:    
Net income (loss) $ (21,042,667) $ 21,093,603
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 (18,691,537) 21,325,189
Unrealized (gain) loss on open futures contracts 27,523,684 (33,311,833)
(Increase) decrease in dividends receivable (3,127) (4,317)
(Increase) decrease in directors' fees and insurance receivable (2,146) (570)
Increase (decrease) in payable due to Broker (15,112,791) 4,220,012
Increase (decrease) in General Partner management fees payable (11,761) 25,770
Increase (decrease) in professional fees payable (31,957) (106,943)
Increase (decrease) in brokerage commissions payable 0 2,200
Increase (decrease) in directors' fees and insurance payable (1,439) (742)
Increase (decrease) in license fees payable (1,988) 2,119
Net cash provided by (used in) operating activities (27,375,729) 13,244,488
Cash Flows from Financing Activities:    
Addition of partnership shares 22,440,164 39,299,030
Redemption of partnership shares (13,639,335) (10,078,068)
Net cash provided by (used in) financing activities 8,800,829 29,220,962
Net Increase (Decrease) in Cash and Cash Equivalents (18,574,900) 42,465,450
Cash and Cash Equivalents, beginning of period 117,373,323 61,380,282
Cash and Cash Equivalents, end of period $ 98,798,423 $ 103,845,732