Fair Value of Ether - Schedule of Changes in Quantity of Ether and Fair Value (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026 USD ($) Ether	Mar. 31, 2025 USD ($) Ether	Dec. 31, 2025 USD ($) Ether
Fair Value Disclosures [Abstract]
Beginning balance | Ether	115,663.9141	121,101.8582	121,101.8582
Purchases | Ether	36,871.4255		156,792.8617
In-Kind Redemptions | Ether	(2,504.9565)
Sales for the redemption of Shares | Ether	(45,316.4348)		(162,038.8128)
Ether transferred for Sponsor Fee | Ether	(63.1604)		(191.993)
Ending balance | Ether	104,650.7879		115,663.9141
Beginning balance	$ 343,746	$ 404,529	$ 404,529
Purchases	102,476		576,881
In-Kind Redemptions	(5,123)
Sales for the redemption of Shares	(111,251)		(582,989)
Ether transferred for Sponsor Fee	(162)		(599)
Net realized gain (loss) on investment in ether transferred to pay Sponsor Fee	54		249
Net realized gain (loss) on In-Kind Redemptions of ether	868
Net realized gain (loss) on investment in ether sold for redemptions	(38,498)	(13,641)	(54,632)
Change in unrealized appreciation (depreciation) on investment in ether	(72,844)	$ (136,196)	307
Ending balance	$ 219,266		$ 343,746