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Investment in Platinum - Schedule of Investment in Platinum (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
oz
Jun. 30, 2019
USD ($)
oz
Schedule of Investments [Abstract]    
Opening balance (in Ounces) | oz 4,469.435 4,491.805
Platinum bullion contributed (in Ounces) | oz 1,984.520
Platinum bullion distributed (in Ounces) | oz (5.861) (22.370)
Change in unrealized depreciation (in Ounces) | oz
Ending balance (in Ounces) | oz 6,448.094 4,469.435
Investment in platinum, fair value, opening balance | $ $ 3,656 [1] $ 3,823
Platinum bullion contributed | $ 1,732
Platinum bullion distributed | $ (6) (22)
Change in unrealized depreciation | $ 421 (145)
Investment in platinum, fair value, ending balance | $ [1] $ 5,803 $ 3,656
[1] Cost of investment in platinum: $6,106 and $4,380, respectively.