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Condensed Statements of Financial Condition - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents (at cost $78,109,650 and $78,344,087, respectively) (Notes 2 and 5) $ 78,109,650 $ 78,344,087
Equity in trading accounts:    
Cash and cash equivalents (at cost $11,078,905 and $14,167,416, respectively) 11,078,905 14,167,416
Unrealized gain (loss) on open commodity futures contracts 4,411,970 5,587,910
Receivable from General Partner (Note 3) 390,601 331,433
Dividends receivable 27,924 16,991
Interest receivable 6,787 9,575
ETF transaction fees receivable 350 350
Total assets 94,026,187 98,457,762
Liabilities and Partners' Capital    
Payable for shares redeemed 1,896,992 3,597,840
General Partner management fees payable (Note 3) 52,245 61,483
Professional fees payable 241,875 243,122
Brokerage commissions payable 2,816 5,316
Directors' fees and insurance payable 2,307 1,128
Total liabilities 2,196,235 3,908,889
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 91,829,952 94,548,873
Total Partners' Capital 91,829,952 94,548,873
Total liabilities and partners' capital $ 94,026,187 $ 98,457,762
Limited Partners' shares outstanding 4,800,000 5,200,000
Net asset value per share $ 19.13 $ 18.18
Market value per share $ 19.14 $ 18.1