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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Statements of Assets and Liabilities [Abstract]    
Investment in platinum at cost $ 658,371 $ 649,850
Common stock, shares authorized Unlimited Unlimited
Common stock, par value $ 0 $ 0
Common stock, shares issued 5,800,000 5,450,000
Common stock, shares outstanding 5,800,000 5,450,000
Net asset value per share $ 87.82 $ 86.97