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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) $ (1,364,350) $ (1,341,500)
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 1,250,388 293,433
Unrealized (gain) loss on open futures contracts (313,578) (975,025)
(Increase) decrease in receivable from General Partner 65,506 48,431
(Increase) decrease in dividends receivable (600) 0
(Increase) decrease in directors' fees and insurance receivable (410) (1,142)
(Increase) decrease in ETF transaction fees receivable (350) 350
Increase (decrease) in General Partner management fees payable (306) 55
Increase (decrease) in professional fees payable (11,095) (29,996)
Increase (decrease) in license fees payable (196) (15)
Net cash provided by (used in) operating activities (374,991) (2,005,409)
Cash Flows from Financing Activities:    
Addition of partnership shares 463,315 4,642,159
Redemption of partnership shares (422,177) (1,990,063)
Net cash provided by (used in) financing activities 41,138 2,652,096
Net Increase (Decrease) in Cash and Cash Equivalents (333,853) 646,687
Cash and Cash Equivalents, beginning of period 11,219,734 15,113,447
Cash and Cash Equivalents, end of period $ 10,885,881 $ 15,760,134