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Condensed Statements of Financial Condition (USD $)
Jun. 30, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents (Note 5) $ 94,385,491 $ 123,736,412
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 25,989,702 42,136,549
Unrealized gain (loss) on open commodity futures contracts (8,462,260) 4,002,120
Dividend receivable 2,209 1,916
Interest receivable   14
Other assets 128,800 127,440
Total assets 112,043,942 170,004,451
Liabilities and Partners' Capital    
Investment payable   33
Payable for units redeemed 1,789,753  
Professional fees payable 281,560 407,121
General Partner management fees payable (Note 3) 52,108 88,691
Brokerage commissions payable 4,422 6,022
Other liabilities 9,617 12,704
Total liabilities 2,137,460 514,571
Commitments and Contingencies (Notes 3, 4, and 5)      
Partners' Capital    
General Partner      
Limited Partners 109,906,482 169,489,880
Total Partners' Capital 109,906,482 169,489,880
Total liabilities and partners' capital $ 112,043,942 $ 170,004,451
Limited Partners' units outstanding 2,900,000 3,900,000
Net asset value per unit $ 37.90 $ 43.46
Market value per unit $ 37.74 $ 43.48