Note 4 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Revenue from Contract with Customer, Including Assessed Tax	$ 10,251	$ 8,452
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	10,032	8,325
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	6,192	6,642
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,840	1,930
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	(247)
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	219	127
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 219	$ 127