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Condensed Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash Flows from Operating Activities:    
Net loss $ (2,308,059) $ (3,389,297)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Decrease in commodity futures trading account - cash and cash equivalents 2,072,571 1,258,987
Unrealized (gain) loss on futures contracts 547,240 (347,910)
Decrease in receivable from General Partner 17,729 85,583
(Increase) decrease in dividend receivable 453 (620)
Decrease in interest receivable 0 11
Increase in other assets (1,856) (3,064)
Decrease in professional fees payable (63,335) (88,409)
Decrease in General Partner management fees payable (2,138) (6,642)
Increase in brokerage commissions payable 10 290
Increase in other liabilities 215 21
Net cash provided by (used in) operating activities 262,830 (2,491,050)
Cash Flows from Financing Activities:    
Addition of partnership units 41,878,777 61,112,049
Redemption of partnership units (45,759,062) (49,903,149)
Net cash provided by (used in) financing activities (3,880,285) 11,208,900
Net Increase (Decrease) in Cash and Cash Equivalents (3,617,455) 8,717,850
Cash and Cash Equivalents, beginning of period 39,506,019 29,961,706
Cash and Cash Equivalents, end of period $ 35,888,564 $ 38,679,556