Note 2 - Significant Accounting Policies - Activity in Ether (Details)		3 Months Ended
	Jun. 24, 2024	Mar. 31, 2026 USD ($)		Mar. 31, 2025 USD ($)
Beginning balance		3,467,229		1,071,415
Beginning balance, average cost		$ 12,538,047,760		$ 3,543,902,275
Beginning balance, fair value		$ 10,303,043,495	[1]	$ 3,571,669,777
Ether purchased	3,031	564,146	[2]	302,532
Ether purchased, average cost		$ 1,454,835,663	[2]	$ 938,629,210
Ether purchased, fair value		$ 1,454,835,663	[2]	$ 938,629,210
Ether sold for the redemption of shares		(993,501)	[3]	(181,672)
Ether sold for the redemption of shares, average cost		$ (3,309,498,370)	[3]	$ (593,395,677)
Ether sold for the redemption of shares, fair value		(2,380,759,699)	[3]	(390,054,002)
Ether sold for the redemption of shares, realized gain (loss)		$ (928,738,671)	[3]	$ (203,341,675)
Ether sold to pay expenses		(2,538)		(509)
Ether sold to pay expenses, average cost		$ (9,097,897)		$ (1,670,167)
Ether sold to pay expenses, fair value		(5,807,934)		(1,356,996)
Ether sold to pay expenses, realized gain (loss)		(3,289,963)		(313,171)
Net realized gain (loss), fair value		(932,028,634)	[4]	(203,654,846)	[5]
Net change in unrealized appreciation/depreciation, fair value		$ (2,059,492,330)		$ (1,728,580,085)
Ending balance		3,035,336		1,191,766
Ending balance, average cost		$ 10,674,287,156		$ 3,887,465,641
Ending balance, fair value		6,379,790,561	[1]	2,186,653,058
Ending balance, realized gain (loss)		$ (932,028,634)	[4]	$ (203,654,846)	[5]

[1] Cost of investment in ether: $10,674,287,156 and $12,538,047,760, respectively.

[2] Includes ether purchased in-kind for Shares issued of $621,312,812.

[3] Includes ether paid in-kind for Shares redeemed of $820,369,484 (Cost of ether paid was $1,011,388,564 and realized loss of ether paid was $191,019,080).

[4] Includes $41,760,600 of realized gains and $(973,789,234) of realized losses.

[5] Includes $436,231 of realized gains and $(204,091,077) of realized losses.