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Statements of Financial Condition (USD $)
Dec. 31, 2011
Dec. 31, 2010
Assets    
Cash and cash equivalents (Note 5) $ 19,719,092 $ 30,313,275
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 10,131,179 6,966,692
Unrealized loss on open commodity futures contracts (8,583,320) (2,175,060)
Receivable from General Partner (Note 3) 113,169 151,689
Dividend receivable 195 1,063
Interest receivable 8  
Other assets 203 558
Total assets 21,380,526 35,258,217
Liabilities and Partners' Capital    
Investment payable 8  
Professional fees payable 151,075 205,005
General Partner management fees payable (Note 3) 14,661 23,857
Brokerage commissions payable 4,260 4,685
Other liabilities 976 2,657
Total liabilities 170,980 236,204
Commitments and Contingencies (Notes 3, 4, and 5)      
Partners' Capital    
General Partner      
Limited Partners 21,209,546 35,022,013
Total Partners' Capital 21,209,546 35,022,013
Total liabilities and partners' capital $ 21,380,526 $ 35,258,217
Limited Partners' units outstanding 1,000,000 1,000,000
Net asset value per unit $ 21.21 $ 35.02
Market value per unit $ 21.12 $ 34.97