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Significant Accounting Policies (Details Narrative) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accounting Policies [Abstract]          
Percentage of platinum held by sub-custodians 2.27%   2.27%    
Platinum payable $ 0   $ 0   $ 0
Platinum receivable 0   $ 0   0
Minimum block of shares issued redeemed against platinum     50,000    
Reserve for uncertain tax positions $ 0   $ 0   0
Expense ratio [1] 0.60% 0.60% 0.60% 0.60%  
Maximum sponsor fee for legal expenses     $ 100,000    
Sponsor Fees $ 2,208,592 $ 951,400 4,396,187 $ 1,946,097  
Fees payable to Sponsor 666,971   666,971   $ 665,333
All other expenses $ 0 $ 0 $ 0 $ 0  
[1] Annualized for periods less than one year.