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Condensed Statements of Financial Condition (USD $)
Sep. 30, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents (Note 5) $ 41,393,586 $ 19,719,092
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 7,096,170 10,131,179
Unrealized gain (loss) on open commodity futures contracts 2,965,180 (8,583,320)
Receivable from General Partner (Note 3) 42,354 113,169
Dividend receivable 394 195
Interest receivable 35 8
Other assets 807 203
Total assets 51,498,526 21,380,526
Liabilities and Partners' Capital    
Investment payable 0 8
Professional fees payable 80,377 151,075
General Partner management fees payable (Note 3) 28,723 14,661
Brokerage commissions payable 4,008 4,260
Other liabilities 2,167 976
Total liabilities 115,275 170,980
Commitments and Contingencies (Notes 3, 4, and 5)      
Partners' Capital    
General Partner 0 0
Limited Partners 51,383,251 21,209,546
Total Partners' Capital 51,383,251 21,209,546
Total liabilities and partners' capital $ 51,498,526 $ 21,380,526
Limited Partners' units outstanding 2,750,000 1,000,000
Net asset value per unit $ 18.68 $ 21.21
Market value per unit $ 18.68 $ 21.12