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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]      
Net Assets - beginning of period $ 8,845 $ 3,655 $ 3,821
Creation of 2,650,000, 1,000,000 and - shares respectively 28,667 9,813
Redemption of (150,000), (450,000) and - shares respectively (1,344) (3,382)
Net investment income (loss) (130) (37) (18)
Net realized gain (loss) from platinum bullion sold to pay expenses 11 (3) (3)
Net realized gain (loss) from platinum bullion distributed for redemptions (23) (799)
Net change in unrealized gain (loss) on investment in platinum bullion 1,452 (402) (145)
Net Assets - end of period $ 37,478 $ 8,845 $ 3,655