Note 7 - Subsequent Events (Details Textual) - USD ($)		2 Months Ended	7 Months Ended	12 Months Ended
	Jan. 05, 2024	Dec. 31, 2023	Dec. 31, 2023	Jan. 11, 2025
Stock Issued During Period, Shares, New Issues (in shares)		4,000
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
BlackRock Financial Management, Inc. [Member]
Stock Issued During Period, Shares, New Issues (in shares)			4,000
Shares Issued, Price Per Share (in dollars per share)		$ 25	$ 25
Subsequent Event [Member]
Sponsors Fee Annualized Accrual Rate Based on Daily Net Asset Value	0.25%
Subsequent Event [Member] | BlackRock Financial Management, Inc. [Member]
Stock Issued During Period, Shares, New Issues (in shares)	400,000
Shares Issued, Price Per Share (in dollars per share)	$ 25
Proceeds from Issuance of Common Stock	$ 10,000,000