Note 12 - Financial Information by Business Segment (Details Textual) - USD ($)	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 3,133,000	$ 4,412,000
Investment Management Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,133,000	4,412,000
Investment Management Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,700,000	3,900,000
Investment Management Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 424,000	$ 499,000