Note 4 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 2,818	$ 3,728	$ 5,951	$ 8,140
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,790	3,695	5,893	8,072
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,462	3,305	5,171	7,218
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	459	525	965	1,135
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	(131)	(135)	(243)	(281)
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	28	33	58	68
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 28	$ 33	$ 58	$ 68