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Financial Highlights - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value Disclosures [Abstract] |  |  |  |
Net asset value per Share at beginning of year |  | $ 9.80 | $ 8.73 | $ 8.87
Net investment income (loss) | [1] | (0.05) | (0.05) | (0.05)
Net realized and unrealized gain (loss) on investment in platinum |  | 3.26 | 1.12 | (0.09)
Net change in net assets from operations |  | 3.21 | 1.07 | (0.14)
Net asset value per Share at end of year |  | 13.01 | 9.80 | 8.73
Market value per Share at the end of the year |  | $ 13.00 | $ 9.67 | $ 8.84
Total return ratio, at net asset value |  | 32.76% | 12.26% | (1.58%)
Total return ratio, at market price |  | 34.44% | 9.39% | 0.68%
Net Assets – end of year |  | $ 85,206 | $ 43,119 | $ 34,919
Ratio to average net assets |  |  |  |
Net investment loss |  | (0.50%) | (0.50%) | (0.50%)
Expenses |  | 0.50% | 0.50% | 0.50%
[1] | Calculated using the average shares outstanding method.

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