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Condensed Statements of Financial Condition (USD $)
Mar. 31, 2013
Dec. 31, 2012
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 91,933,163 $ 86,708,443
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 6,995,702 11,533,441
Unrealized gain on open commodity futures contracts 3,869,470 1,556,910
Dividend receivable 1,846 2,669
Other assets 60,051 83,430
Total assets 102,860,232 99,884,893
Liabilities and Partners' Capital    
Professional fees payable 220,426 302,530
General Partner management fees payable (Note 3) 50,442 49,895
Brokerage commissions payable 3,642 3,642
Other liabilities 7,277 7,044
Total liabilities 281,787 363,111
Commitments and Contingencies (Notes 3, 4 and 5)      
Partners' Capital    
General Partner 0 0
Limited Partners 102,578,445 99,521,782
Total Partners' Capital 102,578,445 99,521,782
Total liabilities and partners' capital $ 102,860,232 $ 99,884,893
Limited Partners' units outstanding 2,500,000 2,500,000
Net asset value per unit $ 41.03 $ 39.81
Market value per unit $ 40.94 $ 39.67