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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 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Activity in Number of Shares Created and Redeemed:        
Creations (in shares) 22,500,000 33,200,000 97,300,000 90,500,000
Redemptions (in shares) (5,000,000) (6,700,000) (30,400,000) (24,400,000)
Net Change in Number of Shares Created and Redeemed (in shares)     66,900,000 66,100,000
Activity in Value of Shares Created and Redeemed:        
Creations $ 2,076,423 $ 2,164,466 $ 8,734,484 $ 5,400,172
Redemptions $ (435,867) $ (419,841) (2,669,296) (1,364,045)
Net change in Value of Shares Created and Redeemed     $ 6,065,188 $ 4,036,127
SPDR Gold Mini Shares Trust [Member]        
Activity in Number of Shares Created and Redeemed:        
Creations (in shares) 22,500,000 33,200,000 97,300,000 90,500,000
Redemptions (in shares) (5,000,000) (6,700,000) (30,400,000) (24,400,000)
Net Change in Number of Shares Created and Redeemed (in shares)     66,900,000 66,100,000
Activity in Value of Shares Created and Redeemed:        
Creations $ 2,076,423 $ 2,164,466 $ 8,734,484 $ 5,400,172
Redemptions $ (435,867) $ (419,841) (2,669,296) (1,364,045)
Net change in Value of Shares Created and Redeemed     $ 6,065,188 $ 4,036,127