Note 1 - Organization (Details Textual)			3 Months Ended		4 Months Ended	9 Months Ended
	Jun. 24, 2024	May 21, 2024 USD ($) $ / shares shares	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2024 shares	Sep. 30, 2025 shares
Stock Issued During Period, Shares, New Issues (in shares)					51,200,000	458,800,000
Ether Purchased	3,031		2,516,582	384,840	387,871	3,471,085
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