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Statement of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Statement of Financial Position [Abstract]    
Cost of investment in platinum bullion $ 15,519 $ 9,975
Common stock, no par value
Common stock, shares authorized Unlimited Unlimited