Note 3 - Trust Expenses (Details Textual) - USD ($)		3 Months Ended		12 Months Ended
	Jun. 24, 2024	Mar. 31, 2026	Mar. 31, 2025	Jul. 23, 2025
Management and Service Fees, Base Rate	0.25%	0.25%
Sponsor Fees		$ 4,969,537	$ 2,038,502
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		(0)	$ 791,853
Maximum [Member]
Legal Fees Per Year		$ 500,000