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Statements of Financial Condition - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents (at cost $42,728,472 and $83,241,625, respectively) (Notes 2 and 5) $ 42,728,472 $ 83,241,625
Equity in trading accounts:    
Cash and cash equivalents (at cost $24,000,253 and $4,988,459, respectively) 24,000,253 4,988,459
Unrealized gain (loss) on open commodity futures contracts (15,772,193) 11,072,567
Dividends receivable 895 16,769
Interest receivable 1,164 2,694
Total assets 50,958,591 99,322,114
Liabilities and Partners' Capital    
Payable due to Broker 0 7,565,281
General Partner management fees payable (Note 3) 27,633 46,592
Professional fees payable 127,321 145,177
Brokerage commissions payable 3,422 7,362
Directors' fees and insurance payable 371 1,014
License fees payable 1,214 2,786
Total liabilities 159,961 7,768,212
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 50,798,630 91,553,902
Total Partners' Capital 50,798,630 91,553,902
Total liabilities and partners' capital $ 50,958,591 $ 99,322,114
Limited Partners' shares outstanding 2,850,000 4,350,000
Net asset value per share $ 17.82 $ 21.05
Market value per share $ 17.96 $ 20.92