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Significant Accounting Policies (Details Narrative)
 12 Months Ended
Jun. 30, 2021
USD ($)
oz
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Accounting Policies [Abstract]      
Fee paid to sponsor, annualized rate 0.50%    
Fees payable to sponsor, value $ 16,000 $ 4,000  
Sponsor's Fee $ 130,000 $ 37,000 $ 18,000
Sponsor fee description Sponsor's Fee was $130,460 for the year ended June 30, 2021, or 0.50% of the Trust's assets on an annualized basis $37,135 for the year ended June 30, 2020, or 0.50% of the Trust's assets on an annualized basis $18,482 for the year ended June 30, 2019, or 0.50% of the Trust's assets on an annualized basis
Minimum block of shares issued redeemed | shares 50,000    
Transaction fee for creations and redemptions $ 500    
Maximum amount of platinum to be held by trust unallocated account | oz 192    
Open tax year for examination As of June 30, 2021, the 2021, 2020, 2019 and 2018 tax years remain open for examination.