Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Schedule of Investments [Abstract] | ||
| Cost of investment in platinum bullion | $ 164,519 | $ 65,762 |
| Common stock, par value | $ 0 | $ 0 |
| Common stock, shares authorized | Unlimited | Unlimited |
| X | ||||||||||
- Definition Face amount per share of no-par value common stock. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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