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Note 7 - Financial Highlights - Summary of Financial Highlights (Details) - $ / shares
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Net Asset Value    
Net Asset Value per Share, beginning of period $ 52.12 $ 37.11
Net Investment income/(loss) (0.01) (0.01)
Net Realized and Change in Unrealized Gain/(Loss) (0.38) 3.8
Net Income/(Loss) (0.39) 3.79
Net Asset Value per Share, end of period 51.73 40.9
Market Value per Share, beginning of period 52.13 36.66
Market Value per Share, end of period $ 51.99 $ 40.91
Ratio to average net assets    
Net investment loss [1] (0.10%) (0.10%)
Gross expenses [1] 0.10% 0.10%
Net expenses [1] 0.10% 0.10%
Total Return, at Net Asset Value [2] (0.75%) 10.21%
Total Return, at Market Value [2] (0.27%) 11.59%
SPDR Gold Mini Shares Trust [Member]    
Net Asset Value    
Net Asset Value per Share, beginning of period $ 52.12 $ 37.11
Net Investment income/(loss) (0.01) (0.01)
Net Realized and Change in Unrealized Gain/(Loss) (0.38) 3.8
Net Income/(Loss) (0.39) 3.79
Net Asset Value per Share, end of period 51.73 40.9
Market Value per Share, beginning of period 52.13 36.66
Market Value per Share, end of period $ 51.99 $ 40.91
Ratio to average net assets    
Net investment loss (0.10%) (0.10%)
Gross expenses 0.10% 0.10%
Net expenses 0.10% 0.10%
Total Return, at Net Asset Value (0.75%) 10.21%
Total Return, at Market Value (0.27%) 11.59%
[1] Percentages are annualized.
[2] Percentages are not annualized.