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Note 2 - Significant Accounting Policies - Activity in Number and Value of Shares Created and Redeemed (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Activity in Number of Shares Created and Redeemed:    
Creations 18,800,000 6,900,000
Redemptions (15,600,000) (6,700,000)
Net Change in Number of Shares Created and Redeemed 3,200,000 200,000
Activity in Value of Shares Created and Redeemed:    
Creations $ 994,230 $ 271,189
Redemptions (826,139) (255,238)
Net change in Value of Shares Created and Redeemed $ 168,091 $ 15,951
SPDR Gold Mini Shares Trust [Member]    
Activity in Number of Shares Created and Redeemed:    
Creations 18,800,000 6,900,000
Redemptions (15,600,000) (6,700,000)
Net Change in Number of Shares Created and Redeemed 3,200,000 200,000
Activity in Value of Shares Created and Redeemed:    
Creations $ 994,230 $ 271,189
Redemptions (826,139) (255,238)
Net change in Value of Shares Created and Redeemed $ 168,091 $ 15,951