Note 11 - Financial Information by Business Segment (Details Textual) - USD ($)	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 4,412,000	$ 6,521,000
Investment Management Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	4,412,000	6,521,000
Investment Management Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	499,000	1,200,000
Investment Management Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 3,900,000	$ 5,300,000