Financial Highlights - Summary of Per Share Performance (Details) - $ / shares		3 Months Ended
		Mar. 31, 2026		Mar. 31, 2025
Investment Company, Financial Highlights [Abstract]
Principal Market NAV per-share, beginning of period		$ 21.28		$ 23.96
Investment Company, Investment Income (Loss) from Operations, Per Share [Abstract]
Net investment loss	[1]	(0.01)		(0.01)
Net realized and change in unrealized appreciation (depreciation) on investment in ether		(6.27)	[2]	(10.85)
Net change in net assets from operations		(6.28)		(10.86)
Principal Market NAV per-share, end of period		$ 15		$ 13.1
Total return, at net asset value	[3]	(29.51%)		(45.33%)
Ratios to average net assets
Gross expenses	[4]	0.20%		0.20%
Net expenses	[4]	0.20%		0.14%
Net investment loss	[4]	(0.20%)		(0.14%)

[1] Calculated using average Shares outstanding.

[2] Because of the timing of subscriptions and redemptions in relation to fluctuating markets at value, the amount shown may not agree with the change in aggregate gains and losses.

[3] Total return is calculated based on the change in Principal Market NAV during the reporting period. An individual shareholder’s total return and ratios may vary from the above total return and ratios based on the timing of share transactions from the Trust. Total return for the period is not annualized.

[4] Annualized.