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Financial Highlights (Unaudited) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
 [1]
Per Share Performance (for a Share outstanding throughout each year)      
Net asset value per Share at beginning of year $ 8.04 $ 8.12 [1] $ 8.49
Net investment income (loss) [2] (0.05) (0.04) (0.04)
Net realized and unrealized gain (loss) on investment in platinum 2.42 (0.04) (0.33)
Net change in net assets from operations 2.37 (0.08) (0.37)
Net asset value per Share at end of year $ 10.41 $ 8.04 $ 8.12
Total return ratio, at net asset value 29.48% (0.99%) (4.36%)
Net assets $ 37,478 $ 8,845 $ 3,655
Net investment loss (0.50%) (0.50%) (0.50%)
Expenses 0.50% 0.50% 0.50%
[1] Adjusted for effects of stock split. Stock split was effective on March 21, 2019. See Note 1.
[2] Calculated using the average shares outstanding method.