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Note 3 - Trust Expenses (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 05, 2024
Sep. 30, 2024
Sep. 30, 2024
Jan. 11, 2025
Sponsors Fee Annualized Accrual Rate Based on Daily Net Asset Value 0.25%   0.25%  
Sponsor's Fees   $ 13,122,598 $ 28,844,181  
Sponsor Fees Waived   $ 1,633,880 4,324,550  
Maximum [Member]        
Legal Fees Per Year     $ 500,000  
Forecast [Member]        
Sponsors Fee After Fee Waiver, Percentage       0.12%
Maximum Amount of Trust Assets for Sponsor's Fee After Fee Waiver       $ 5,000,000,000