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Note 12 - Financial Information by Business Segment (Details Textual)	3 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Revenue from Contract with Customer, Including Assessed Tax	$ 2,251,000	$ 2,157,000
Number of Reportable Segments	2
Investment Management Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,251,000	2,157,000
Investment Management Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,500,000	1,800,000
Investment Management Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 727,000	$ 393,000

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