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Statements of Financial Condition (USD $)
Dec. 31, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 39,506,019 $ 29,961,706
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 4,934,103 8,300,817
Unrealized gain (loss) on open commodity futures contracts 739,330 (916,570)
Receivable from General Partner (Note 3) 47,248 104,431
Dividend receivable 1,036 340
Interest receivable 0 11
Other assets 827 278
Total assets 45,228,563 37,451,013
Liabilities and Partners' Capital    
Professional fees payable 125,339 146,522
General Partner management fees payable (Note 3) 28,273 33,910
Brokerage commissions payable 1,221 916
Other liabilities 1,109 1,277
Total liabilities 155,942 182,625
Commitments and Contingencies (Notes 3, 4 and 5) 0 0
Partners' Capital    
General Partner 0 0
Limited Partners 45,072,621 37,268,388
Total Partners' Capital 45,072,621 37,268,388
Total liabilities and partners' capital $ 45,228,563 $ 37,451,013
Limited Partners' units outstanding 550,000 500,000
Net asset value per unit $ 81.95 $ 74.54
Market value per unit $ 82.07 $ 74.64