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Financial Highlights (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Statement of Cash Flows [Abstract]    
Net asset value per Share at beginning of period $ 8.04 $ 8.12
Net investment gain (loss) (0.01) [1] (0.01) [2]
Net realized and unrealized gain (loss) on investment in platinum bullion 0.69 0.81
Net change in net assets from operations 0.68 0.80
Net asset value per Share at end of period $ 8.72 $ 8.92
Total return ratio, at net asset value [3] 8.46% 9.85%
Net assets $ 14,828 $ 5,801
Net investment loss [4] (0.50%) (0.50%)
Expenses [4] 0.50% 0.50%
[1] Calculated using the average shares outstanding method.
[2] Calculated using the average shares outstanding method
[3] Percentage not annualized.
[4] Percentage annualized.