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Condensed Statements of Financial Condition (USD $)
Mar. 31, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents (Note 5) $ 136,449,005 $ 123,736,412
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 24,291,380 42,136,549
Unrealized gain on open commodity futures contracts 11,303,840 4,002,120
Dividend receivable 2,352 1,916
Interest receivable 49 14
Other assets 133,640 127,440
Total assets 172,180,266 170,004,451
Liabilities and Partners' Capital    
Investment payable   33
Professional fees payable 283,535 407,121
General Partner management fees payable (Note 3) 89,360 88,691
Brokerage commissions payable 6,022 6,022
Other liabilities 19,659 12,704
Total liabilities 398,576 514,571
Commitments and Contingencies (Notes 3, 4, and 5)      
Partners' Capital    
General Partner      
Limited Partners 171,781,690 169,489,880
Total Partners' Capital 171,781,690 169,489,880
Total liabilities and partners' capital $ 172,180,266 $ 170,004,451
Limited Partners' units outstanding 3,750,000 3,900,000
Net asset value per unit $ 45.81 $ 43.46
Market value per unit $ 45.81 $ 43.48