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Statements of Assets and Liabilities (Parenthetical)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
Statement of Financial Position [Abstract]  
Cost of investment in platinum bullion | $ $ 4,408 [1]
Common stock, no par value | $ / shares
Common stock, shares authorized Unlimited
[1] No comparative has been provided as operations commenced on January 11, 2018. See Note 1.