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Statements of Assets and Liabilities (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Investment in platinum at cost $ 1,033,440 $ 1,074,183
Common stock, shares authorized Unlimited Unlimited
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares outstanding 11,750,000 12,200,000
Common stock, shares issued 11,750,000 12,200,000
Net asset value per share (in dollars per share) $ 90.60 $ 83.52