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Condensed Statements of Financial Condition (USD $)
Jun. 30, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents (Note 5) $ 38,679,556 $ 29,961,706
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 7,041,830 8,300,817
Unrealized loss on open commodity futures contracts (568,660) (916,570)
Receivable from General Partner (Note 3) 18,848 104,431
Dividend receivable 960 340
Interest receivable 0 11
Other assets 3,342 278
Total assets 45,175,876 37,451,013
Liabilities and Partners' Capital    
Professional fees payable 58,113 146,522
General Partner management fees payable (Note 3) 27,268 33,910
Brokerage commissions payable 1,206 916
Other liabilities 1,298 1,277
Total liabilities 87,885 182,625
Commitments and Contingencies (Notes 3, 4, and 5)      
Partners' Capital    
General Partner 0 0
Limited Partners 45,087,991 37,268,388
Total Partners' Capital 45,087,991 37,268,388
Total liabilities and partners' capital $ 45,175,876 $ 37,451,013
Limited Partners' units outstanding 650,000 500,000
Net asset value per unit $ 69.37 $ 74.54
Market value per unit $ 69.19 $ 74.64