Note 2 - Significant Accounting Policies - Activity in Ether (Details)		1 Months Ended	3 Months Ended		4 Months Ended
	Jun. 24, 2024	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)		Sep. 30, 2024 USD ($)
Beginning balance		0	3,031		0
Beginning balance, average cost		$ 0	$ 10,000,000		$ 0
Beginning balance, fair value		0	$ 10,590,295		$ 0
Ether purchased	3,031		384,840		387,871
Ether purchased, average cost			$ 1,147,427,156		$ 1,157,427,156
Ether purchased, fair value			$ 1,147,427,156		$ 1,157,427,156
Ether sold to pay expenses			(28)		(28)
Ether sold to pay expenses, average cost			$ (84,988)		$ (84,988)
Ether sold to pay expenses, fair value			(63,328)		(63,328)
Ether sold to pay expenses, realized gain (loss)			(21,660)		(21,660)
Net realized loss, fair value			(21,660)		(21,660)
Net change in unrealized appreciation/depreciation, fair value		$ 590,295	$ (138,509,122)		$ (137,918,827)
Ending balance		3,031	387,843		387,843
Ending balance, average cost		$ 10,000,000	$ 1,157,342,168		$ 1,157,342,168
Ending balance, fair value		$ 10,590,295	1,019,423,341	[1]	1,019,423,341	[1]
Ending balance, realized gain (loss)			$ (21,660)		$ (21,660)

[1] Cost of investment in ether: $1,157,342,168.