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Condensed Statements of Financial Condition (USD $)
Jun. 30, 2011
Dec. 31, 2010
Assets    
Cash and cash equivalents (Note 5) $ 32,583,105 $ 30,313,275
Equity in UBS Securities LLC trading accounts:    
Cash 4,761,743 6,966,692
Unrealized loss on open commodity futures contracts (1,458,490) (2,175,060)
Receivable from General Partner 73,573 151,689
Dividend receivable 255 1,063
Other assets 799 558
Total assets 35,960,985 35,258,217
Liabilities and Partners' Capital    
Investment payable 12  
Professional fees payable 99,188 205,005
General Partner management fees payable (Note 3) 22,812 23,857
Brokerage commissions payable 4,485 4,685
Other liabilities 2,341 2,657
Total liabilities 128,838 236,204
Commitments and Contingencies (Notes 3, 4 and 5)    
Partners' Capital    
General Partner    
Limited Partners 35,832,147 35,022,013
Total Partners' Capital 35,832,147 35,022,013
Total liabilities and partners' capital $ 35,960,985 $ 35,258,217
Limited Partners' units outstanding 1,100,000 1,000,000
Net asset value per unit $ 32.57 $ 35.02
Market value per unit $ 32.66 $ 34.97