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Financial Highlights (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Fair Value Disclosures [Abstract]    
Net asset value per Share at beginning of period $ 13.01 $ 9.80
Net investment loss [1] (0.02) (0.01)
Net realized and unrealized gain (loss) on investment in platinum bullion 2.13 (0.26)
Net change in net assets from operations 2.11 (0.27)
Net asset value per Share at end of period 15.12 9.53
Market value per Share at end of period $ 15.11 $ 9.51
Total return ratio, at net asset value [2] 16.22% (2.76%)
Total return ratio, at market price [2] 16.23% (1.69%)
Net Assets – end of period $ 129,274 $ 41,915
Ratio to average net assets    
Net investment loss [3] (0.50%) (0.50%)
Expenses [3] 0.50% 0.50%
[1] Calculated using the average shares outstanding method.
[2] Percentage not annualized.
[3] Percentage annualized.