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Financial Highlights (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Per Share Performance (for a Share outstanding throughout the entire period)    
Net asset value per Share at beginning of period $ 81.21 [1] $ 84.91
Net investment gain (loss) (0.10) [1] (0.21)
Net realized and unrealized gain (loss) on investment in platinum (2.09) [1] (5.68)
Net change in net assets from operations (2.19) [1] (5.89)
Net asset value per Share at end of period $ 79.02 $ 79.02
Total return ratio, at net asset value [2] (2.70%) [1] (6.94%)
Net assets $ 3,556 [1] $ 3,556
Net investment loss [3] (0.50%) [1] (0.50%)
Expenses [3] 0.50% [1] 0.50%
[1] No comparative has been provided as operations commenced on January 11, 2018. See Note 1.
[2] Percentage not annualized.
[3] Percentage annualized.