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Basis of Accounting and Significant Accounting Policies (Details Narrative)
 9 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
oz
shares
Mar. 31, 2023
Jun. 30, 2023
USD ($)
Percenatge of allocated platinum available for sale 99.82% 99.78%  
Fair value measurements transfers $ 0   $ 0
Fee paid to sponsor, annualized rate 0.50%    
Minimum block of shares issued redeemed | shares 50,000    
Transaction fee for creations and redemptions $ 500    
Trust unallocated account | oz 192    
Uncertain tax positions taken in tax returns $ 0   0
Income tax examiation, description the 2023, 2022 and 2021 tax years remain open for examination    
Sponsor [Member]      
Fees payable to sponsor, value $ 15,458   $ 15,441