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Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Flows from Operating Activities:    
Net income (loss) $ 76,615,279 $ (78,883,355)
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 12,779,710 12,321,580
(Increase) decrease in receivable from General Partner 521,498 (56,591)
(Increase) decrease in dividends receivable (4,985) 8,914
(Increase) decrease in interest receivable 10,615 4,670
(Increase) decrease in prepaid insurance [1] (63,073) (7,587)
(Increase) decrease in prepaid registration fees 63,900 0
(Increase) decrease in ETF transaction Fees receivable 0 (1,050)
Increase (decrease) in General Partner management fees payable 2,635 3,710
Increase (decrease) in professional fees payable (36,500) (53,133)
Increase (decrease) in brokerage commissions payable 1,296 300
Increase (decrease) in directors' fees payable 281 (199)
Net cash provided by (used in) operating activities 89,890,656 (66,662,741)
Cash Flows from Financing Activities:    
Addition of partnership shares 27,967,380 109,964,533
Redemption of partnership shares (121,342,917) (2,180,105)
Net cash provided by (used in) financing activities (93,375,537) 107,784,428
Net Increase (Decrease) in Cash and Cash Equivalents (3,484,881) 41,121,687
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period   345,338,258
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period $ 341,853,377 $ 124,725,127
[1] *    Certain prior year amounts have been reclassified for consistency with the current presentation.