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Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
EXPENSES        
Sponsor's Fee $ 793,532 $ 820,346 $ 2,348,395 $ 2,197,448
Total expenses 793,000 820,000 2,348,000 2,197,000
Net investment loss (793,000) (820,000) (2,348,000) (2,197,000)
REALIZED AND UNREALIZED GAINS / (LOSSES)        
Realized loss on platinum transferred to pay expenses (220,000) (154,000) (660,000) (669,000)
Realized loss on platinum distributed for the redemption of Shares (4,463,000) (6,640,000) (16,357,000) (20,604,000)
Change in unrealized gain on investment in platinum 4,451,000 23,773,000 22,469,000 96,716,000
Total (loss) / gain on investment in platinum (232,000) 16,979,000 5,452,000 75,443,000
Change in net assets from operations $ (1,025,000) $ 16,159,000 $ 3,104,000 $ 73,246,000
Net (decrease) / increase in net assets per Share $ (0.18) $ 3.08 $ 0.54 $ 14.49
Weighted average number of Shares (in Shares) 5,820,109 5,240,761 5,729,304 5,054,015