Note 4 - Investment Management and Other Fees (Details Textual) - USD ($)	3 Months Ended			9 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Jul. 01, 2023	Jun. 30, 2023
Accounts Receivable, Allowance for Credit Loss	$ 0			$ 0		$ 0	$ 0
Fund Clients [Member]
Receivables, Net, Current	858,000			858,000			1,100,000
Accounts Receivable, Allowance for Credit Loss	0			0			0
U S Global E T Fs [Member]
Unitary Management Fee, Percentage of Average Net Assets		0.60%
Aggregate Fees Waived and Expenses Borne	37,000		$ 28,000	115,000	$ 77,000
U S Global E T Fs [Member] | Fund Clients [Member]
Receivables, Net, Current	$ 738,000			738,000			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	$ 193,000		$ 299,000	$ 638,000	$ 822,000
Investment Advisory Fees, Fee Adjustment Base Percentage Adjustment When Fund Performance is Not Within Limits to Benchmark Index	0.25%			0.25%
Investment Advisory Fees, Fee Adjustment Percent, Minimum Performance to Designed Benchmark Over Prior Rolling 12 Months	5.00%			5.00%
Annual Administrative Fee Rate	0.05%
U S Global Investors Funds [Member] | Fund Clients [Member]
Receivables, Net, Current	$ 120,000			$ 120,000			$ 126,000