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Condensed Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash Flows from Operating Activities:    
Net loss $ (6,771,289) $ (493,801)
Adjustments to reconcile net loss to net cash used in operating activities:    
(Increase) decrease in commodity futures trading account - cash and cash equivalents (2,294,705) 2,057,477
Unrealized (gain) loss on futures contracts 953,790 (1,515,790)
Decrease in receivable from General Partner 96,862 114,019
(Increase) decrease in dividend receivable (56) 427
Increase in interest receivable (20)  
Increase in other assets (2,270) (1,538)
Decrease in investment payable (8)  
Decrease in professional fees payable (126,003) (155,685)
Increase (decrease) in General Partner management fees payable 3,825 (4,203)
Decrease in brokerage commissions payable (972) (200)
Increase (decrease) in other liabilities 948 (949)
Net cash used in operating activities (8,139,898) (243)
Cash Flows from Financing Activities:    
Addition of partnership units 15,024,496 6,781,994
Redemption of partnership units (844,650) (3,529,524)
Net cash provided by financing activities 14,179,846 3,252,470
Net Increase in Cash and Cash Equivalents 6,039,948 3,252,227
Cash and Cash Equivalents, beginning of period 19,719,092 30,313,275
Cash and Cash Equivalents, end of period $ 25,759,040 $ 33,565,502