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Note 3 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Revenue from Contract with Customer, Including Assessed Tax	$ 2,251	$ 2,157
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,209	2,127
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,524	1,764
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	685	466
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	(103)
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	42	30
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 42	$ 30

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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