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Financial Highlights (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Per Share Performance (for a Share outstanding throughout each period)    
Net asset value per Share at beginning of period [1] $ 8.12 $ 8.49
Net investment gain (loss) [1],[2] (0.01) (0.01)
Net realized and unrealized gain (loss) on investment in platinum [1] 0.81 (0.36)
Net change in net assets from operations [1] 0.80 (0.37)
Net asset value per Share at end of period [1] $ 8.92 $ 8.12
Total return ratio, at net asset value [3] 9.85% (4.36%)
Net assets [1] $ 5,801 $ 3,655
Ratio to average net assets    
Net investment loss [1],[4] (0.50%) (0.50%)
Expenses [1],[4] 0.50% 0.50%
[1] Adjusted for effects of stock split. The stock split was effective on March 21, 2019. See Note 1.
[2] Calculated using the average shares outstanding method
[3] Percentage not annualized.
[4] Percentage annualized.