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Investment in Platinum - Schedule of Investment in Platinum (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
oz
Investment In Platinum  
Opening balance (in Ounces) | oz 3,000.000 [1],[2]
Platinum bullion contributed (in Ounces) | oz 1,499.359 [1]
Platinum bullion distributed (in Ounces) | oz (1.744) [1]
Change in unrealized appreciation (in Ounces) | oz [1]
Closing balance (in Ounces) | oz 4,497.615 [3]
Investment in platinum, fair value, opening balance | $ $ 2,913 [1],[2]
Platinum bullion contributed | $ 1,496 [1]
Platinum bullion distributed | $ (1) [1]
Change in unrealized gain on investment in platinum | $ (198) [1]
Investment in platinum, fair value, closing balance | $ $ 4,210 [3],[4]
[1] No comparative data has been provided as operations commenced on January 11, 2018. See Note 1.
[2] Operations commenced on January 11, 2018. The amount represents the initial deposit. See Note 1.
[3] No comparative has been provided as operations commenced on January 11, 2018. See Note 1.
[4] Cost of investment in platinum: $4,408.