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Financial Highlights (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Fair Value Disclosures [Abstract]        
Net asset value per Share at beginning of period $ 19.49 $ 8.83 $ 13.01 $ 9.80
Net investment loss [1] (0.03) (0.01) (0.07) (0.04)
Net realized and unrealized gain (loss) on investment in platinum (1.14) 0.76 5.38 (0.18)
Net change in net assets from operations (1.17) 0.75 5.31 (0.22)
Net asset value per Share at end of period 18.32 9.58 18.32 9.58
Market Value per Share at end of period $ 18.91 $ 9.68 $ 18.91 $ 9.68
Total return ratio, at net asset value [2] (6.00%) 8.49% 40.81% (2.24%)
Total return ratio, at market price (4.16%) 10.13% 45.46% 0.10%
Net Assets – end of period $ 220,738 $ 50,292 $ 220,738 $ 50,292
Ratio to average net assets        
Net investment loss [3] (0.50%) (0.50%) (0.50%) (0.50%)
Expenses [3] 0.50% 0.50% 0.50% 0.50%
[1] Calculated using the average shares outstanding method.
[2] Percentage not annualized.
[3] Percentage annualized.