Fair Value of ETC - Additional Information (Detail) |
Mar. 31, 2026
ETC
$ / shares
|
Dec. 31, 2025
ETC
$ / shares
|
|---|---|---|
| Fair Value Disclosures [Abstract] | ||
| Investment owned balance shares held by custodian | ETC | 10,918,003.9756609 | 10,985,516.92607291 |
| Ethereum classic Fair Value Per Share | $ / shares | $ 8.19 | $ 11.47 |