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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) $ 42,673,401 $ 39,506,019
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 3,081,767 4,934,103
Unrealized gain on open commodity futures contracts 77,060 739,330
Receivable from General Partner (Note 3) 14,868 47,248
Dividend receivable 722 1,036
Other assets 3,672 827
Total assets 45,851,490 45,228,563
Liabilities and Partners' Capital    
Professional fees payable 30,882 125,339
General Partner management fees payable (Note 3) 27,700 28,273
Brokerage commissions payable 1,071 1,221
Other liabilities 1,127 1,109
Total liabilities 60,780 155,942
Commitments and Contingencies (Notes 3, 4 and 5)      
Partners' Capital    
General Partner 0 0
Limited Partners 45,790,710 45,072,621
Total Partners' Capital 45,790,710 45,072,621
Total liabilities and partners' capital $ 45,851,490 $ 45,228,563
Limited Partners' units outstanding 550,000 550,000
Net asset value per unit $ 83.26 $ 81.95
Market value per unit $ 83.17 $ 82.07