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Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investment Income        
Interest $ 10,836,500 $ 13,037,036 $ 31,814,938 $ 40,198,623
Total investment income 10,836,500 13,037,036 31,814,938 40,198,623
Expenses        
Sponsor’s fees 1,905,877 1,801,762 5,563,724 5,612,921
Brokerage commissions and fees 147,798 159,320 510,481 581,121
Total expenses 2,053,675 1,961,082 6,074,205 6,194,042
Net Investment income 8,782,825 11,075,954 25,740,733 34,004,581
Net Realized and Unrealized Gain (Loss)        
Short-term investments 1,244 1,222 3,399 1,426
Futures contracts 17,956,102 (77,701,360) 48,119,207 (21,217,007)
Net realized gain (loss) 17,957,346 (77,700,138) 48,122,606 (21,215,581)
Net change in unrealized appreciation/depreciation on:        
Short-term investments 62,780 (71,699) (163,619) (171,413)
Futures contracts 11,839,522 6,815,884 (25,642,257) 24,341,184
Net change in unrealized appreciation/depreciation 11,902,302 6,744,185 (25,805,876) 24,169,771
Net realized and unrealized gain (loss) 29,859,648 (70,955,953) 22,316,730 2,954,190
Net increase (decrease) in net assets resulting from operations $ 38,642,473 $ (59,879,999) $ 48,057,463 $ 36,958,771
Net increase (decrease) in net assets per Share (in dollars per share) [1] $ 0.87 $ (1.34) $ 1.08 $ 0.8
[1] Net increase (decrease) in net assets per Share based on average shares outstanding during the period.