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Statements of Financial Condition (USD $)
Dec. 31, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents (Note 2 and 5) $ 86,708,443 $ 123,736,412
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 11,533,441 42,136,549
Unrealized gain on open commodity futures contracts 1,556,910 4,002,120
Dividend receivable 2,669 1,916
Interest receivable   14
Other assets 83,430 127,440
Total assets 99,884,893 170,004,451
Liabilities and Partners' Capital    
Investment payable   33
Professional fees payable 302,530 407,121
General Partner management fees payable (Note 3) 49,895 88,691
License fees payable 4,014 8,088
Brokerage commissions payable 3,642 6,022
Directors' fees payable 2,877 4,463
Other liabilities 153 153
Total liabilities 363,111 514,571
Commitments and Contingencies (Notes 3, 4 and 5)      
Partners' Capital    
General Partner      
Limited Partners 99,521,782 169,489,880
Total Partners' Capital 99,521,782 169,489,880
Total liabilities and partners' capital $ 99,884,893 $ 170,004,451
Limited Partners' units outstanding 2,500,000 3,900,000
Net asset value per unit $ 39.81 $ 43.46
Market value per unit $ 39.67 $ 43.48