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Schedule of Trust Investments Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Jun. 30, 2023
Jun. 30, 2022
Platform Operator, Crypto Asset [Line Items]      
Total $ 36,509 [1] $ 34,934 [1] $ 44,821
Fair Value, Inputs, Level 1 [Member]      
Platform Operator, Crypto Asset [Line Items]      
Total 36,509 34,934  
Fair Value, Inputs, Level 1 [Member] | Platinum [Member]      
Platform Operator, Crypto Asset [Line Items]      
Total 36,509 34,934  
Fair Value, Inputs, Level 2 [Member]      
Platform Operator, Crypto Asset [Line Items]      
Total  
Fair Value, Inputs, Level 2 [Member] | Platinum [Member]      
Platform Operator, Crypto Asset [Line Items]      
Total  
Fair Value, Inputs, Level 3 [Member]      
Platform Operator, Crypto Asset [Line Items]      
Total  
Fair Value, Inputs, Level 3 [Member] | Platinum [Member]      
Platform Operator, Crypto Asset [Line Items]      
Total  
[1] Cost of investment in platinum: $40,965 and $40,355, respectively.