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Condensed Statements of Financial Condition (USD $)
Mar. 31, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents (Note 5) $ 25,759,040 $ 19,719,092
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 12,425,884 10,131,179
Unrealized loss on open commodity futures contracts (9,537,110) (8,583,320)
Receivable for units sold 849,893  
Receivable for General Partner (Note 3) 16,307 113,169
Dividend receivable 251 195
Interest receivable 28 8
Other assets 2,473 203
Total assets 29,516,766 21,380,526
Liabilities and Partners' Capital    
Investment payable   8
Payable for units redeemed 818,550  
Professional fees payable 25,072 151,075
General Partner management fees payable (Note 3) 18,486 14,661
Brokerage commissions payable 3,288 4,260
Other liabilities 1,924 976
Total liabilities 867,320 170,980
Commitments and Contingencies (Notes 3, 4, and 5)      
Partners' Capital    
General Partner      
Limited Partners 28,649,446 21,209,546
Total Partners' Capital 28,649,446 21,209,546
Total liabilities and partners' capital $ 29,516,766 $ 21,380,526
Limited Partners' units outstanding 1,750,000 1,000,000
Net asset value per unit $ 16.37 $ 21.21
Market value per unit $ 16.28 $ 21.12