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Investment in Platinum - Schedule of Investment in Platinum (Details)
$ in Thousands
 6 Months Ended
Dec. 31, 2018
USD ($)
oz
Jun. 30, 2018
USD ($)
oz
Investment In Platinum    
Opening balance (in Ounces) | oz 4,491.805 [1] 3,000.000 [2]
Platinum bullion contributed (in Ounces) | oz 1,499.359
Platinum bullion distributed (in Ounces) | oz (11.348) (7.554)
Change in unrealized depreciation (in Ounces) | oz
Closing balance (in Ounces) | oz 4,480.457 4,491.805 [1]
Investment in platinum, fair value, opening balance | $ $ 3,823 [1],[3] $ 2,943 [2]
Platinum bullion contributed | $ 1,466
Platinum bullion distributed | $ (12) (7)
Change in unrealized depreciation | $ (254) (579)
Investment in platinum, fair value, closing balance | $ [3] $ 3,557 $ 3,823 [1]
[1] 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] Cost of investment in platinum: $4,390 and $4,402, respectively.