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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) $ (2,470,405) $ 1,266,173
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 (492,382) 2,647,597
Unrealized (gain) loss on open futures contracts 3,109,473 (3,879,007)
(Increase) decrease in receivable from General Partner 77,132 41,391
(Increase) decrease in dividends receivable (748) (391)
(Increase) decrease in directors' fees and insurance receivable (665) 913
(Increase) decrease in ETF transaction fees receivable 350 (350)
Increase (decrease) in payable due to Broker (2,099,689) 0
Increase (decrease) in General Partner management fees payable (4,219) 1,073
Increase (decrease) in professional fees payable (78,380) (15,416)
Increase (decrease) in brokerage commissions payable (620) 0
Increase (decrease) in directors' fees and insurance payable (106) 0
Increase (decrease) in license fees payable (347) (162)
Net cash provided by (used in) operating activities (1,960,606) 61,821
Cash Flows from Financing Activities:    
Addition of partnership shares 543,667 926,324
Redemption of partnership shares (4,996,389) (422,177)
Net cash provided by (used in) financing activities (4,452,722) 504,147
Net Increase (Decrease) in Cash and Cash Equivalents (6,413,328) 565,968
Cash and Cash Equivalents, beginning of period 15,061,018 11,219,734
Cash and Cash Equivalents, end of period $ 8,647,690 $ 11,785,702