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Note 7 - Financial Highlights - Summary of Financial Highlights (Details) - $ / shares
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Net Asset Value        
Net asset value per Share, beginning of period $ 35.98 $ 36.17 $ 33.20 $ 34.65
Net investment income/(loss) (0.01) (0.01) (0.02) (0.03)
Net Realized and Change in Unrealized Gain/(Loss) 3.32 2.43 6.11 3.97
Net Income/(Loss) 3.31 2.42 6.09 3.94
Net asset value per Share, end of period 39.29 38.59 39.29 38.59
Market value per Share, beginning of period 36.19 36.36 32.98 34.92
Market value per Share, end of period $ 39.11 $ 38.47 $ 39.11 $ 38.47
Ratio to average net assets        
Net investment loss [1] (0.10%) (0.14%) (0.10%) (0.16%)
Gross expenses [1] 0.10% 0.14% 0.10% 0.16%
Net expenses [1] 0.10% 0.14% 0.10% 0.16%
Total Return, at net asset value [2] 9.20% 6.69% 18.34% 11.37%
Total Return, at market value [2] 8.07% 5.80% 18.59% 10.17%
SPDR Gold Mini Shares Trust [Member]        
Net Asset Value        
Net asset value per Share, beginning of period $ 35.98 $ 36.17 $ 33.20 $ 34.65
Net investment income/(loss) (0.01) (0.01) (0.02) (0.03)
Net Realized and Change in Unrealized Gain/(Loss) 3.32 2.43 6.11 3.97
Net Income/(Loss) 3.31 2.42 6.09 3.94
Net asset value per Share, end of period 39.29 38.59 39.29 38.59
Market value per Share, beginning of period 36.19 36.36 32.98 34.92
Market value per Share, end of period $ 39.11 $ 38.47 $ 39.11 $ 38.47
Ratio to average net assets        
Net investment loss (0.10%) (0.14%) (0.10%) (0.16%)
Gross expenses 0.10% 0.14% 0.10% 0.16%
Net expenses 0.10% 0.14% 0.10% 0.16%
Total Return, at net asset value 9.20% 6.69% 18.34% 11.37%
Total Return, at market value 8.07% 5.80% 18.59% 10.17%
[1] Percentages are annualized.
[2] Percentages are not annualized.