Note 5 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 24,714	$ 21,654
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	24,525	21,445
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	20,962	17,127
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,543	3,836
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	20	482
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	189	209
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 189	$ 209