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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash Flows from Operating Activities:    
Net income (loss) $ 30,431,939 $ (140,098,159)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts 60,851,805 32,144,157
(Increase) decrease in dividends receivable (62,165) 2,602
(Increase) decrease in interest receivable 4,316 0
(Increase) decrease in directors' fees and insurance receivable (16,494) (8,901)
(Increase) decrease in prepaid registration fees 53,825 (53,749)
(Increase) decrease in ETF transaction fees receivable 2,000 2,000
Increase (decrease) in payable due to Broker 0 (44,770,339)
Increase (decrease) in General Partner management fees payable (130,068) (85,594)
Increase (decrease) in professional fees payable (426,461) (163,651)
Increase (decrease) in brokerage commissions payable (12,500) (12,400)
Increase (decrease) in directors' fees and insurance payable (8,345) (5,417)
Increase (decrease) in license fees payable (8,425) (12,573)
Net cash provided by (used in) operating activities 90,679,427 (153,062,024)
Cash Flows from Financing Activities:    
Addition of partnership shares 841,684,628 926,956,014
Redemption of partnership shares (1,242,337,656) (899,185,668)
Net cash provided by (used in) financing activities (400,653,028) 27,770,346
Net Increase (Decrease) in Cash and Cash Equivalents (309,973,601) (125,291,678)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 651,938,294 567,786,082
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period 341,964,693 442,494,404
Components of Cash and Cash Equivalents:    
Cash and Cash Equivalents 311,177,329 394,372,298
Equity in Trading Accounts:    
Cash and Cash Equivalents 30,787,364 48,122,106
Total Cash, Cash Equivalents and Equity in Trading Accounts $ 341,964,693 $ 442,494,404