Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Investment in ether, at cost	$ 281,576	$ 333,212
Common stock, no par value	$ 0	$ 0
Common Stock, Shares Authorized, Unlimited [Fixed List]	Unlimited	Unlimited