Note 1 - Organization (Details Textual)			1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 24, 2024	May 21, 2024 USD ($) $ / shares shares	Jun. 30, 2024 shares	Jun. 30, 2025	Jun. 30, 2025 shares
Stock Issued During Period, Shares, New Issues (in shares)			400,000		126,120,000
Ether Purchased	3,031		3,031	651,971	954,503
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