Note 11 - Financial Information by Business Segment (Details Textual) - USD ($)	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	$ 3,728,000	$ 6,574,000	$ 8,140,000	$ 13,095,000
Investment Management Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,728,000	6,574,000	8,140,000	13,095,000
Investment Management Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	423,000	922,000	1,100,000	2,300,000
Investment Management Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 3,300,000	$ 5,500,000	$ 7,200,000	$ 10,800,000