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Organization - Additional Information (Detail)
 3 Months Ended 9 Months Ended 15 Months Ended
Jul. 09, 2024
USD ($)
$ / shares
shares
Jun. 17, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2025
Creationbasket
shares
Organization [Line Items]              
Shares issued (in shares) | shares     660,000 783,000 787,000 935,000  
Stock issued | $     $ 26,961,783 $ 23,895,890 $ 23,995,890 $ 33,387,002  
Number of shares issued per Creation Basket | shares             5,000
Minimum number of Creation Baskets that can be purchased | Creationbasket             1
Redemption value | $     $ 24,757,476 $ 100,000 $ 100,000 $ 26,208,385  
Initial Seed Shares              
Organization [Line Items]              
Shares issued (in shares) | shares   4,000          
Stock issued | $   $ 100,000          
Share issued price per share | $ / shares $ 25            
Redemption value | $ $ 100,000            
Creation Baskets              
Organization [Line Items]              
Number of creation basket shares | shares 3,000            
Creation Baskets | Ethereum              
Organization [Line Items]              
Number of ethereums, per share | $ / shares $ 30.042