Note 4 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Revenue from Contract with Customer, Including Assessed Tax	$ 8,452	$ 10,984
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	8,325	10,869
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	6,642	9,416
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,930	1,882
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	(247)	(429)
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	127	115
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 127	$ 115