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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Statement of Financial Position [Abstract]    
Cost of investment in platinum bullion $ 4,390 $ 4,402 [1]
Common stock, no par value
Common stock, shares authorized Unlimited Unlimited
[1] Operations commenced on January 11, 2018. See Note 1.