Note 3 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 4,412	$ 6,521
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	4,377	6,470
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,913	5,316
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	610	966
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	(146)	188
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	35	51
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 35	$ 51