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Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash Flows from Operating Activities:    
Net income (loss) $ (1,910,579) $ (1,364,350)
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 (99,949) 1,250,388
Unrealized (gain) loss on open futures contracts 2,185,571 (313,578)
(Increase) decrease in receivable from General Partner (15,053) 65,506
(Increase) decrease in dividends receivable (265) (600)
(Increase) decrease in directors' fees and insurance receivable (905) (410)
(Increase) decrease in ETF transaction fees receivable 0 (350)
Increase (decrease) in payable due to Broker (1,977,624) 0
Increase (decrease) in General Partner management fees payable (2,858) (306)
Increase (decrease) in professional fees payable (17,550) (11,095)
Increase (decrease) in brokerage commissions payable (620) 0
Increase (decrease) in directors' fees and insurance payable (106) 0
Increase (decrease) in license fees payable (238) (196)
Net cash provided by (used in) operating activities (1,840,176) (374,991)
Cash Flows from Financing Activities:    
Addition of partnership shares 543,667 463,315
Redemption of partnership shares (3,368,036) (422,177)
Net cash provided by (used in) financing activities (2,824,369) 41,138
Net Increase (Decrease) in Cash and Cash Equivalents (4,664,545) (333,853)
Cash and Cash Equivalents, beginning of period 15,061,018 11,219,734
Cash and Cash Equivalents, end of period $ 10,396,473 $ 10,885,881