Financial Highlights - Summary of Financial Highlights of NAV per Share (Details) - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net Asset Value
Net asset value per Share, beginning of period	$ 29.61	$ 33.28
Net realized and change in unrealized gain (loss) on investments in Ether	(8.67)	(15.02)
Net investment income (loss)	(0.01)	(0.02)
Net income (loss)	(8.68)	(15.04)
Net asset value per Share, end of period	20.93	18.24
Market value per Share, beginning of period	29.59	33.39
Market value per Share, end of period	$ 20.86	$ 18.24
Ratio to average Net Assets
Net Investment income (loss)	(0.25%)	(0.25%)
Expenses	0.25%	0.25%
Total Return, at net asset value	(29.32%)	(45.19%)
Total Return, at market value	(29.50%)	(45.37%)