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Condensed Statements of Financial Condition - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Assets    
Cash and cash equivalents (at cost $89,534,920 and $117,373,323, respectively) (Notes 2 and 5) $ 89,534,920 $ 117,373,323
Equity in trading accounts:    
Cash and cash equivalents (at cost $19,614,897 and $6,997,275, respectively) 19,614,897 6,997,275
Unrealized gain (loss) on open commodity futures contracts (81,224) 17,277,775
Dividends receivable 16,316 10,794
Interest receivable 9,844 0
Directors' fees and insurance receivable 353 0
ETF transaction fees receivable 350 0
Total assets 109,095,456 141,659,167
Liabilities and Partners' Capital    
Payable due to Broker 0 15,112,791
Payable for shares redeemed 1,831,218 0
General Partner management fees payable (Note 3) 54,271 64,286
Professional fees payable 72,717 80,375
Brokerage commissions payable 7,362 7,362
Directors' fees and insurance payable 0 1,439
License fees payable 3,359 5,106
Total liabilities 1,968,927 15,271,359
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 107,126,529 126,387,808
Total Partners' Capital 107,126,529 126,387,808
Total liabilities and partners' capital $ 109,095,456 $ 141,659,167
Limited Partners' shares outstanding 5,850,000 6,200,000
Net asset value per share $ 18.31 $ 20.39
Market value per share $ 18.24 $ 20.4