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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash Flows from Operating Activities:    
Net income (loss) $ (17,395,702) $ 29,316,357
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
(Increase) decrease in commodity futures trading account - cash and cash equivalents (3,751,628) (1,463,705)
Unrealized (gain) loss on open futures contracts (3,364,120) (6,533,930)
(Increase) decrease in receivable from General Partner 6,267 39,398
(Increase) decrease in dividends receivable (1,895) (4,380)
(Increase) decrease in directors' fees and insurance receivable (1,960) (887)
(Increase) decrease in ETF transaction fees receivable 700 0
Increase (decrease) in General Partner management fees payable (14,967) 28,411
Increase (decrease) in professional fees payable (30,754) (98,169)
Increase (decrease) in brokerage commissions payable (1,860) 1,430
Increase (decrease) in directors' fees and insurance payable (1,184) (661)
Net cash provided by (used in) operating activities (24,557,103) 21,283,864
Cash Flows from Financing Activities:    
Addition of partnership shares 40,082,469 28,350,923
Redemption of partnership shares (21,090,615) (23,030,449)
Net cash provided by (used in) financing activities 18,991,854 5,320,474
Net Increase (Decrease) in Cash and Cash Equivalents (5,565,249) 26,604,338
Cash and Cash Equivalents, beginning of period 103,167,056 67,996,295
Cash and Cash Equivalents, end of period $ 97,601,807 $ 94,600,633