v3.26.1
Fair Value of Ether - Additional Information (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Ether
$ / shares
Dec. 31, 2025
USD ($)
Ether
$ / shares
Dec. 31, 2024
USD ($)
Ether
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Trust held net closing balance of ether | Ether 106,742.1564 115,663.9141 121,101.8582
Investment in ether, at fair value $ 168,496,000 $ 343,746,000 $ 404,529,000
Ether index price per share | $ / shares $ 1,578.53    
Fair value of ether net realized losses $ 44,389,730,000    
Fair value of ether cumulative realized gains 945,688,000    
Fair value of ether cumulative realized losses 45,335,418,000    
CME CF Ether      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Investment in ether, at fair value $ 168,280,077 $ 342,919,216  
Ether index price per share | $ / shares $ 1,576.51 $ 2,964.79  
Lukka Prime Rate      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Investment in ether, at fair value $ 168,495,696 $ 343,746,213  
Ether index price per share | $ / shares $ 1,578.53 $ 2,971.94