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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash Flows from Operating Activities:    
Net income (loss) $ 54,705,644 $ 15,071,039
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Change in unrealized (gain) loss on open commodity futures contracts 7,628,810 341,900
(Increase) decrease in receivable from General Partner (417,292) 36,890
(Increase) decrease in dividends receivable 22,302 (16,991)
(Increase) decrease in ETF transaction Fees receivable (21) 0
(Increase) decrease in interest receivable (476) (904)
(Increase) decrease in prepaid insurance [1] (2,716) (2,767)
(Increase) decrease in prepaid registration fees (159,902) 0
Increase (decrease) in General Partner management fees payable 178,892 963
Increase (decrease) in professional fees payable (4,641) (107,763)
Increase (decrease) in brokerage commissions payable 12,689 0
Increase (decrease) in directors' fees payable [1] 2,116 314
Net cash provided by (used in) operating activities 61,965,405 15,322,681
Cash Flows from Financing Activities:    
Addition of partnership shares 383,337,923 17,034,820
Redemption of partnership shares (165,382,511) (28,827,507)
Net cash provided by (used in) financing activities 217,955,412 (11,792,687)
Net Increase (Decrease) in Cash and Cash Equivalents 279,920,817 3,529,994
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 83,603,440 80,057,642
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period $ 363,524,257 $ 83,587,636
[1] *    Certain prior year amounts have been reclassified for consistency with the current presentation.