v3.26.1
Note 1 - Organization (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 19, 2026
Feb. 18, 2026
Jan. 14, 2026
Jun. 30, 2026
 [1]
Jun. 30, 2026
Stock Issued During Period, Shares, New Issues (in shares)         25,000,000
Crypto Asset, Purchase   $ 51,455   $ 273,515,403 $ 680,416,742 [2]
Management and Service Fees, Base Rate 0.25%       0.25%
BlackRock Financial Management, Inc. [Member]          
Stock Issued During Period, Shares, New Issues (in shares)     4,000    
Stock Issued During Period, Value, New Issues     $ 100,000    
Shares Issued, Price Per Share (in dollars per share)     $ 25    
[1] Includes ether purchased in-kind for shares issued of $75,351,373.
[2] Includes ether purchased in-kind for Shares issued of $133,215,012.