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Statements of Financial Condition - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 103,167,056 $ 67,996,295
Equity in trading accounts:    
Cash and cash equivalents 8,297,821 20,732,135
Unrealized gain (loss) on open commodity futures contracts 2,332,880 (7,442,340)
Receivable for shares sold 0 1,238,809
Receivable from General Partner (Note 3) 189,745 135,365
Dividends receivable 10,378 39
ETF transaction fees receivable 700 700
Total assets 113,998,580 82,661,003
Liabilities and Capital    
Payable for shares redeemed 785,318 0
General Partner management fees payable (Note 3) 74,409 49,275
Professional fees payable 107,421 113,211
Brokerage commissions payable 7,176 5,746
Directors' fees and insurance payable 1,184 661
Total liabilities 975,508 168,893
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 113,023,072 82,492,110
Total Partners' Capital 113,023,072 82,492,110
Total liabilities and partners' capital $ 113,998,580 $ 82,661,003
Limited Partners' shares outstanding 7,200,000 6,750,000
Net asset value per share $ 15.70 $ 12.22
Market value per share $ 15.68 $ 12.24