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Statements of Assets and Liabilities (Parenthetical) - USD ($) $ / shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2024	Jun. 30, 2023
Schedule of Investments [Abstract]
Cost of investment in platinum bullion	$ 40,965	$ 40,355
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	Unlimited	Unlimited

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