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Condensed Statements of Financial Condition - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents (at cost $90,179,694 and $78,344,087, respectively) (Notes 2 and 5) $ 90,179,694 $ 78,344,087
Equity in trading accounts:    
Cash and cash equivalents (at cost $8,492,982 and $14,167,416, respectively) 8,492,982 14,167,416
Unrealized gain (loss) on open commodity futures contracts 6,636,860 5,587,910
Receivable from General Partner (Note 3) 408,892 331,433
Dividends receivable 39,154 16,991
Interest receivable 3,807 9,575
Directors' fees and insurance receivable 2,346 0
ETF transaction fees receivable 0 350
Total assets 105,763,735 98,457,762
Liabilities and Partners' Capital    
Payable for shares redeemed 0 3,597,840
General Partner management fees payable (Note 3) 61,579 61,483
Professional fees payable 187,683 243,122
Brokerage commissions payable 2,816 5,316
Directors' fees and insurance payable 0 1,128
Total liabilities 252,078 3,908,889
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 105,511,657 94,548,873
Total Partners' Capital 105,511,657 94,548,873
Total liabilities and partners' capital $ 105,763,735 $ 98,457,762
Limited Partners' shares outstanding 4,750,000 5,200,000
Net asset value per share $ 22.21 $ 18.18
Market value per share $ 22.18 $ 18.10