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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash Flows from Operating Activities:    
Net income (loss) $ 89,894,322 $ 76,615,279
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 20,849,530 12,779,710
(Increase) decrease in related party receivable 4,500,000  
(Increase) decrease in receivable from General Partner   521,498
(Increase) decrease in dividends receivable (20,226) (4,985)
(Increase) decrease in interest receivable 134 10,615
(Increase) decrease in prepaid insurance* (45,714) (63,073)
(Increase) decrease in prepaid registration fees   63,900
(Increase) decrease in ETF transaction Fees receivable (750)  
Increase (decrease) in General Partner management fees payable 55,509 2,635
Increase (decrease) in professional fees payable (32,703) (36,500)
Increase (decrease) in brokerage commissions payable (1,658) 1,296
Increase (decrease) in directors' fees payable* 28 281
Increase (decrease) in registration fees payable 63,900  
Net cash provided by (used in) operating activities 115,262,372 89,890,656
Cash Flows from Financing Activities:    
Addition of partnership shares 24,372,751 27,967,380
Redemption of partnership shares (58,733,793) (121,342,917)
Net cash provided by (used in) financing activities (34,361,042) (93,375,537)
Net Increase (Decrease) in Cash and Cash Equivalents 80,901,330 (3,484,881)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year 209,980,620 345,338,258
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year $ 290,881,950 $ 341,853,377