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Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Schedule of Investments [Abstract] |  |
Cost of investment in platinum bullion | $ 65,762 | $ 43,369
Common stock, par value | $ 0 | $ 0
Common stock, shares authorized | Unlimited | Unlimited

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