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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Statements of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   5,450,000 4,750,000 4,750,000
Creations (in Shares)   1,000,000   1,500,000
Redemptions (in Shares)   (650,000)   (800,000)
Closing balance (in Shares) 5,800,000 5,800,000   5,450,000
Opening balance   $ 473,978 $ 399,557 $ 399,557
Net investment loss $ (793) (2,348) (2,197) (2,942)
Realized loss on investment in platinum   (17,017)   (24,447)
Change in unrealized gain on investment in platinum 4,451 22,469 $ 96,716 35,077
Change in unrealized gain on unsettled creations or redemptions       19
Creations   91,445   143,689
Redemptions   (59,178)   (76,975)
Closing balance $ 509,349 $ 509,349   $ 473,978