Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2026 |
Dec. 31, 2025 |
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| Statement of Financial Position [Abstract] | ||
| Investment in ETC, at fair value (cost $82,445 and $82,955 as of March 31, 2026 and December 31, 2025, respectively) | $ 81,418 | $ 82,955 |
| Number of authorized shares not disclosed | true | true |
| Common stock, shares authorized, unlimited | Unlimited | Unlimited |
| X | ||||||||||
- Definition Number of authorized shares not disclosed. No definition available.
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| X | ||||||||||
- Definition Indicates whether number of common shares permitted to be issued is unlimited. Acceptable value is "Unlimited". Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Cost of the investment. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- References No definition available.
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