Fair Value of Ether - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2026 USD ($) Ether $ / shares	Dec. 31, 2025 USD ($) Ether $ / shares	Dec. 31, 2024 USD ($) Ether
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Trust held net closing balance of ether | Ether	104,650.7879	115,663.9141	121,101.8582
Investment in ether, at fair value	$ 219,266,000	$ 343,746,000	$ 404,529,000
Ether index price per share | $ / shares	$ 2,095.22
Fair value of ether net realized losses	$ 37,575,301,000
Fair value of ether cumulative realized gains	922,371,000
Fair value of ether cumulative realized losses	38,497,672,000
CME CF Ether
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investment in ether, at fair value	$ 219,465,260	$ 342,919,216
Ether index price per share | $ / shares	$ 2,097.12	$ 2,964.79
Lukka Prime Rate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investment in ether, at fair value	$ 219,266,424	$ 343,746,213
Ether index price per share | $ / shares	$ 2,095.22	$ 2,971.94