Note 5 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Revenue from Contract with Customer, Including Assessed Tax	$ 10,984	$ 15,074
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	10,869	14,940
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	9,416	13,174
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,882	2,256
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	(429)	(490)
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	115	134
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 115	$ 134