Note 5 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 15,074	$ 24,714
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	14,940	24,525
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	13,174	20,962
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,256	3,543
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	(490)	20
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	134	189
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 134	$ 189