Note 3 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 3,728	$ 6,574	$ 8,140	$ 13,095
Investment And Advisory Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,695	6,525	8,072	12,995
Investment And Advisory Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,305	5,452	7,218	10,768
Investment And Advisory Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	525	932	1,135	1,898
Investment Performance [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	(135)	141	(281)	329
Administrative Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	33	49	68	100
Administrative Service [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 33	$ 49	$ 68	$ 100