Note 3 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Statement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 3,624	$ 6,175	$ 11,764	$ 19,270
Investment And Advisory Services [Member]
Statement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,591	6,129	11,663	19,124
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Statement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,142	5,372	10,360	16,140
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Statement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	558	877	1,693	2,775
Investment Performance [Member] | U S Global Investors Funds [Member]
Statement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(109)	(120)	(390)	209
Administrative Service [Member]
Statement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	33	46	101	146
Administrative Service [Member] | U S Global Investors Funds [Member]
Statement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 33	$ 46	$ 101	$ 146