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Condensed Statements of Financial Condition (USD $)
Jun. 30, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents (Note 5) $ 33,777,195 $ 19,719,092
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 6,707,457 10,131,179
Unrealized loss on open commodity futures contracts (2,185,700) (8,583,320)
Receivable for units sold 2,593,326  
Receivable for General Partner (Note 3) 28,921 113,169
Dividend receivable 299 195
Interest receivable   8
Other assets 1,993 203
Total assets 40,923,491 21,380,526
Liabilities and Partners' Capital    
Investment payable   8
Professional fees payable 50,143 151,075
General Partner management fees payable (Note 3) 22,321 14,661
Brokerage commissions payable 4,008 4,260
Other liabilities 1,452 976
Total liabilities 77,924 170,980
Commitments and Contingencies (Notes 3, 4, and 5)      
Partners' Capital    
General Partner      
Limited Partners 40,845,567 21,209,546
Total Partners' Capital 40,845,567 21,209,546
Total liabilities and partners' capital $ 40,923,491 $ 21,380,526
Limited Partners' units outstanding 2,350,000 1,000,000
Net asset value per unit $ 17.38 $ 21.21
Market value per unit $ 17.44 $ 21.12