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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value Assets and Liabilities, Transfers Between Level One, Level Two and Level Three $ 0 $ 0
Percentage of Gold Held as Good Delivery Gold Bars 100.00%  
Maximum Number of Business Days to Transfer Ownership of Gold 1 day  
Minimum Block of Shares Issued Redeemed Against Gold 100,000  
Gain (Loss) on Investments $ (68,661,000) 583,559,000
Gain (Loss) on Sale of Trust Assets to Pay Expenses 616,000 135,000
Net Realized Gain (Loss) From Gold Distributed for the Redemption of Shares 221,085,000 20,609,000
Unrealized Gain (Loss) on Investments (290,362,000) 562,815,000
Liability for Uncertainty in Income Taxes, Current $ 0  
Income Tax Examination, Description There were no examinations in progress at period end.  
SPDR Gold Mini Shares Trust [Member]    
Fair Value Assets and Liabilities, Transfers Between Level One, Level Two and Level Three $ 0 0
Percentage of Gold Held as Good Delivery Gold Bars 100.00%  
Maximum Number of Business Days to Transfer Ownership of Gold 1 day  
Minimum Block of Shares Issued Redeemed Against Gold 100,000  
Gain (Loss) on Investments $ (68,661,000) 583,559,000
Gain (Loss) on Sale of Trust Assets to Pay Expenses 616,000 135,000
Net Realized Gain (Loss) From Gold Distributed for the Redemption of Shares 221,085,000 20,609,000
Unrealized Gain (Loss) on Investments (290,362,000) $ 562,815,000
Liability for Uncertainty in Income Taxes, Current $ 0  
Income Tax Examination, Description There were no examinations in progress at period end.