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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]      
Opening balance (in shares) 8,600,000 6,550,000 5,700,000
Opening balance $ 841,868 $ 499,078 $ 359,264
Net investment loss (5,840) (3,821) (2,404)
Realized gain on investment in Bullion 15,868 5,495 2,003
Change in unrealized gain (loss) on investment in Bullion (109,394) 139,860 $ 76,595
Change in unrealized gain (loss) on unsettled creations or redemptions $ (28) $ 28  
Creations (in shares) 3,250,000 2,600,000 1,300,000
Creations $ 315,510 $ 241,531 $ 93,189
Redemptions (in shares) (950,000) (550,000) (450,000)
Redemptions $ (87,471) $ (40,303) $ (29,569)
Closing balance (in shares) 10,900,000 8,600,000 6,550,000
Closing balance $ 970,513 $ 841,868 $ 499,078