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Investment in Platinum - Schedule of Investment in Platinum (Details)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
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 26,121.071 10,893.552
Platinum distributed (in Ounces) | oz (1,586.874) (4,491.851)
Change in unrealized depreciation (in Ounces) | oz
Ending balance (in Ounces) | oz 35,405.333 10,871.136
Investment in platinum, fair value, opening balance | $ $ 8,849 [1] $ 3,656
Platinum contributed | $ 28,668 9,814
Platinum distributed | $ (1,475) (4,219)
Change in unrealized depreciation | $ 1,452 (402)
Investment in platinum, fair value, ending balance | $ [1] $ 37,494 $ 8,849
[1] Cost of investment in platinum: $37,168 and $9,975, respectively.