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Investment in Platinum - Schedule of Investment in Platinum (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
oz
Jun. 30, 2020
USD ($)
oz
Schedule of Investments [Abstract]    
Opening balance (in Ounces) | oz 10,871.136 4,469.435
Platinum contributed (in Ounces) | oz 5,924.481 10,893.552
Platinum distributed (in Ounces) | oz (15.217) (4,491.851)
Change in unrealized appreciation (depreciation) (in Ounces) | oz
Ending balance (in Ounces) | oz 16,780.400 10,871.136
Investment in platinum, fair value, opening balance | $ $ 8,849 [1] $ 3,656
Platinum contributed | $ 5,558 9,814
Platinum distributed | $ (14) (4,219)
Change in unrealized appreciation (depreciation) | $ 441 (402)
Investment in platinum, fair value, ending balance | $ [1] $ 14,834 $ 8,849
[1] Cost of investment in platinum: $15,519 and $9,975, respectively.