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Statements of Changes in Net Assets (Unaudited) (2) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Net Assets, Beginning of Period $ 963,872,250 $ 1,127,844,172 $ 1,325,724,380 $ 872,384,122 $ 1,127,844,172 $ 872,384,122
Operations:            
Net investment loss (172,863) (182,704) (203,458) (204,017) (355,567) (407,475)
Net realized gain 9,044,241 14,583,406 7,099,299 3,618,314 23,627,647 10,717,613
Net change in unrealized appreciation/depreciation (42,090,064) 77,200,802 (86,409,036) 77,556,610 35,110,738 (8,852,426)
Net increase (decrease) in net assets resulting from operations (33,218,686) 91,601,504 (79,513,195) 80,970,907 58,382,818 1,457,712
Capital Share Transactions:            
Contributions for Shares issued 102,276,250 75,395,013 0 421,813,732    
Distributions for Shares redeemed (116,382,514) (330,968,439) (210,394,492) (49,444,381)    
Net increase (decrease) in net assets from capital share transactions (14,106,264) (255,573,426) (210,394,492) 372,369,351    
Increase (decrease) in net assets (47,324,950) (163,971,922) (289,907,687) 453,340,258    
Net Assets, End of Period $ 916,547,300 $ 963,872,250 $ 1,035,816,693 $ 1,325,724,380 $ 916,547,300 $ 1,035,816,693
Shares issued and redeemed            
Shares issued (in shares)         9,150,000 22,900,000
Shares redeemed (in shares)         (23,450,000) (13,800,000)
Net increase (decrease) in Shares issued and outstanding (in shares)         (14,300,000) 9,100,000