Note 4 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Revenue from Contract with Customer, Including Assessed Tax	$ 2,593	$ 3,624	$ 8,544	$ 11,764
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,566	3,591	8,458	11,663
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,224	3,142	7,394	10,360
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	443	558	1,408	1,693
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	(101)	(109)	(344)	(390)
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	27	33	86	101
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 27	$ 33	$ 86	$ 101