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Condensed Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities:      
Net income (loss) $ 119,083,909 $ 26,763,267 $ (15,190,394)
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 (1,034,920) (7,451,120) 11,877,420
(Increase) decrease in receivable from General Partner (580,571) 1,610 249,791
(Increase) decrease in dividends receivable 25,849 (8,304) (821)
(Increase) decrease in interest receivable (7,046) (3,515) 8,188
(Increase) decrease in prepaid insurance [1] (267) (588) (527)
(Increase) decrease in prepaid registration fees (94,582)   0
(Increase) decrease in ETF transaction Fees receivable     350
Increase (decrease) in General Partner management fees payable 168,985 2,391 (11,475)
Increase (decrease) in professional fees payable 43,564 (72,583) (52,980)
Increase (decrease) in brokerage commissions payable 18,483   (2,500)
Increase (decrease) in directors' fees payable [1] 1,455 349 778
Net cash provided by (used in) operating activities 117,624,859 19,231,507 (3,122,170)
Cash Flows from Financing Activities:      
Addition of partnership shares 385,408,106 17,034,820 41,996,934
Redemption of partnership shares (241,298,147) (32,720,529) (51,328,625)
Net cash provided by (used in) financing activities 144,109,959 (15,685,709) (9,331,691)
Net Increase (Decrease) in Cash and Cash Equivalents 261,734,818 3,545,798 (12,453,861)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 83,603,440 80,057,642 92,511,503
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period $ 345,338,258 $ 83,603,440 $ 80,057,642
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.