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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Statement of Financial Position [Abstract]    
Cost of investment in platinum bullion $ 6,106 $ 4,380
Common stock, no par value
Common stock, shares authorized Unlimited Unlimited