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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) $ 35,888,564 $ 39,506,019
Equity in UBS Securities LLC trading accounts:    
Cash and cash equivalents 2,861,532 4,934,103
Unrealized gain on open commodity futures contracts 192,090 739,330
Receivable from General Partner (Note 3) 29,519 47,248
Dividend receivable 583 1,036
Other assets 2,683 827
Total assets 38,974,971 45,228,563
Liabilities and Partners' Capital    
Professional fees payable 62,004 125,339
General Partner management fees payable (Note 3) 26,135 28,273
Brokerage commissions payable 1,231 1,221
Other liabilities 1,324 1,109
Total liabilities 90,694 155,942
Commitments and Contingencies (Notes 3, 4 and 5)      
Partners' Capital    
General Partner 0 0
Limited Partners 38,884,277 45,072,621
Total Partners' Capital 38,884,277 45,072,621
Total liabilities and partners' capital $ 38,974,971 $ 45,228,563
Limited Partners' units outstanding 500,000 550,000
Net asset value per unit $ 77.77 $ 81.95
Market value per unit $ 77.67 $ 82.07