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Condensed Statements of Financial Condition (USD $)
Jun. 30, 2013
Dec. 31, 2012
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 24,152,941 $ 39,667,209
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 3,050,999 4,416,055
Unrealized loss on open commodity futures contracts (1,347,400) (906,580)
Receivable from General Partner (Note 3) 32,787 68,503
Dividend receivable 378 423
Other assets 2,649 321
Total assets 25,892,354 43,245,931
Liabilities and Partners' Capital    
Professional fees payable 62,194 125,273
General Partner management fees payable (Note 3) 17,381 28,625
Brokerage commissions payable 2,608 4,008
Other liabilities 1,632 2,334
Total liabilities 83,815 160,240
Commitments and Contingencies (Notes 3, 4 and 5)      
Partners' Capital    
General Partner 0 0
Limited Partners 25,808,539 43,085,691
Total Partners' Capital 25,808,539 43,085,691
Total liabilities and partners' capital $ 25,892,354 $ 43,245,931
Limited Partners' units outstanding 1,500,000 2,500,000
Net asset value per unit $ 17.21 $ 17.23
Market value per unit $ 17.26 $ 17.24