Note 4 - Investment Management and Other Fees (Details Textual) - USD ($)	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023
Fund Clients [Member]
Receivables, Net, Current	$ 914,000		$ 1,100,000
U S Global E T Fs [Member]
Unitary Management Fee, Percentage of Average Net Assets	0.60%
Aggregate Fees Waived and Expenses Borne	$ 35,000	$ 48,000
U S Global E T Fs [Member] | Fund Clients [Member]
Receivables, Net, Current	$ 792,000		1,000,000
U S Global Jets U C I T S E T F [Member]
Unitary Management Fee, Percentage of Average Net Assets	0.65%
U S Global Investors Funds [Member]
Aggregate Fees Waived and Expenses Borne	$ 253,000	$ 220,000
Investment Advisory Fees, Fee Adjustment Base Percentage Adjustment When Fund Performance is Not Within Limits to Benchmark Index	0.25%
Investment Advisory Fees, Fee Adjustment Percent, Minimum Performance to Designed Benchmark Over Prior Rolling 12 Months	5.00%
Annual Administrative Fee Rate	0.05%
U S Global Investors Funds [Member] | Fund Clients [Member]
Receivables, Net, Current	$ 122,000		$ 126,000