Note 1 - Organization (Details Textual)			7 Months Ended
	Jun. 24, 2024	May 21, 2024 USD ($) $ / shares shares	Dec. 31, 2024 shares
Stock Issued During Period, Shares, New Issues (in shares)			147,680,000
Ether Purchased	3,031		1,118,503
Sponsors Fee Annualized Accrual Rate Based on Daily Net Asset Value	0.25%		0.25%
BlackRock Financial Management, Inc. [Member]
Stock Issued During Period, Shares, New Issues (in shares)		400,000
Stock Issued During Period, Value, New Issues | $		$ 10,000,000
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 25