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Statements of Changes in Net Assets (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Stockholders' Equity [Abstract]        
Opening balance $ 1,435,254 $ 991,167 $ 1,039,953 $ 958,831
Opening balance (in shares) 10,425,000 9,600,000 9,500,000 10,450,000
Net investment loss $ (2,415) $ (1,556) $ (6,211) $ (4,432)
Realized gain on investment in Bullion 855 4,502 16,416 17,036
Change in unrealized gain on investment in Bullion 283,601 90,075 551,977 192,597
Creations $ 129,893 $ 7,845 $ 286,980 $ 12,842
Creations (in shares) 850,000 75,000 2,100,000 125,000
Redemptions $ (20,328) $ (41,927) $ (105,169)
Redemptions (in shares)   (200,000) (325,000) (1,100,000)
Closing balance $ 1,847,188 $ 1,071,705 $ 1,847,188 $ 1,071,705
Closing balance (in shares) 11,275,000 9,475,000 11,275,000 9,475,000