Note 3 - Trust Expenses (Details Textual) - USD ($)		3 Months Ended		4 Months Ended	9 Months Ended	12 Months Ended
	Jun. 24, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2025	Jul. 23, 2025
Sponsors Fee Annualized Accrual Rate Based on Daily Net Asset Value	0.25%				0.25%
Sponsor's Fees		$ 7,917,727	$ 358,491	$ 358,911	$ 11,838,343
Sponsors Fee After Fee Waiver, Percentage						0.12%
Maximum Amount of Trust Assets for Sponsor's Fee After Fee Waiver						$ 2,500,000,000
Sponsor Fees Waived		$ 204,795	$ 186,634	$ 186,634	1,748,012
Maximum [Member]
Legal Fees Per Year					$ 500,000