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Financial Highlights - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Per Share Performance (for a Share outstanding throughout the entire period)    
Net asset value per Share at beginning of year [1] $ 117.43 $ 132.59
Income from investment operations:    
Net investment loss [1] (0.62) (0.81)
Total realized and unrealized gains or losses on investment in platinum [1] (32.69) (14.35)
Change in net assets from operations [1] (33.31) (15.16)
Net asset value per Share at end of year [1] $ 84.12 $ 117.43
Weighted average number of shares [1] 5,077,671 5,400,822 [2]
Expense ratio [1] 0.60% 0.60%
Net investment loss ratio [1] (0.60%) (0.60%)
Total return, at net asset value [1] (28.37%) (11.43%)
[1] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946. Refer to Note 2.1 for additional information.
[2] Represents audited amounts prior to the adoption of provisions for an investment company for accounting purposes. Refer to Note 2.1 for additional information.