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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
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%   100.00%    
Maximum Number of Business Days to Transfer Ownership of Gold     2 days    
Minimum Block of Shares Issued Redeemed Against Gold     100,000    
Gain (Loss) on Investments $ 499,160 $ 290,779 $ 900,548 $ 478,567  
Gain (Loss) on Sale of Trust Assets to Pay Expenses 86 164 77 270  
Net Realized Gain (Loss) From Gold Distributed for the Redemption of Shares 7,685 14,710 10,812 29,065  
Unrealized Gain (Loss) on Investments 491,389 275,905 889,659 449,232  
Liability for Uncertainty in Income Taxes, Current $ 0   $ 0    
Income Tax Examination, Description     As of March 31, 2023, the 2021, 2020 and 2019 tax years remain open for examination. 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%   100.00%    
Maximum Number of Business Days to Transfer Ownership of Gold     2 days    
Minimum Block of Shares Issued Redeemed Against Gold     100,000    
Gain (Loss) on Investments $ 499,160 290,779 $ 900,548 478,567  
Gain (Loss) on Sale of Trust Assets to Pay Expenses 86 164 77 270  
Net Realized Gain (Loss) From Gold Distributed for the Redemption of Shares 7,685 14,710 10,812 29,065  
Unrealized Gain (Loss) on Investments 491,389 $ 275,905 889,659 $ 449,232  
Liability for Uncertainty in Income Taxes, Current $ 0   $ 0    
Income Tax Examination, Description     As of March 31, 2023, the 2021, 2020 and 2019 tax years remain open for examination. There were no examinations in progress at period end.