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Condensed Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash Flows from Operating Activities:    
Net income (loss) $ (7,469,112) $ 1,131,849
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 (23,810) 944,253
Unrealized loss on open futures contracts 3,035,200 2,378,680
Decrease in dividends receivable 426 535
(Increase) decrease in receivable from General Partner 39,869 (3,229)
Increase in other assets (589) (857)
Decrease in professional fees payable (74,978) (26,481)
Increase (decrease) in General Partner management fees payable 10,100 (2,614)
Increase (decrease) in brokerage commissions payable 465 (240)
Increase in other liabilities 614 131
Net cash provided by (used in) operating activities (4,481,815) 4,422,027
Cash Flows from Financing Activities:    
Addition of partnership shares 45,864,685 58,653,136
Redemption of partnership shares (27,267,227) (64,579,320)
Net cash provided by (used in) financing activities 18,597,458 (5,926,184)
Net Increase (Decrease) in Cash and Cash Equivalents 14,115,643 (1,504,157)
Cash and Cash Equivalents, beginning of period 25,257,312 39,506,019
Cash and Cash Equivalents, end of period $ 39,372,955 $ 38,001,862