Note 16 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Equity Securities, FV-NI		$ 12,126,000
Equity Securities, FV-NI, Realized Gain (Loss)	$ (53,000)	(192,000)
Payments to Acquire Equity Securities, FV-NI	1,104,000	1,246,000
Realized Gain (Loss) on Principal Payment Proceeds	108,000	610,000
Investment Income, Net	4,148,000	2,393,000
Operating Lease, Lease Income	119,000	104,000
Accounts and Other Receivables, Net, Current	1,328,000	1,036,000
Equity Securities without Readily Determinable Fair Value, Amount	$ 4,682,000	1,349,000
HIVE Blockchain Technologies Ltd. [Member]
Payments to Acquire Equity Securities, FV-NI		41,000
Investment Owned, Balance, Shares (in shares)	15,000
Investment Owned, Fair Value	$ 55,000	27,000
HIVE Blockchain Technologies Ltd. [Member] | Maximum [Member]
Equity Method Investment, Ownership Percentage	1.00%
The Sonar Company [Member]
Investment Owned, Direct Percentage	2.80%
Equity Securities without Readily Determinable Fair Value, Amount	$ 0	0
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount		(175,000)
Receivables From Mutual Funds [Member]
Receivables, Net, Current	884,000	683,000
U S Global Investors Funds [Member]
Equity Securities, FV-NI	9,700,000	10,500,000
Proceeds from Sale of Equity Securities, FV-NI	800,000	0
Equity Securities, FV-NI, Realized Gain (Loss)	(5,000)
Investment Income, Dividends and Capital Gains	351,000	406,000
US Global ETF Clients [Member]
Equity Securities, FV-NI	45,000	32,000
Proceeds from Sale of Equity Securities, FV-NI		60,000
Equity Securities, FV-NI, Realized Gain (Loss)		(19,000)
Payments to Acquire Equity Securities, FV-NI	0	109,000
HIVE Blockchain Technologies Ltd. [Member]
Investment Owned, Fair Value		1,600,000
Proceeds from Sale, Maturity and Collection of Investments	2,300,000	2,300,000
Realized Gain (Loss) on Principal Payment Proceeds	81,000	457,000
Investment Income, Net	108,000	610,000
Consulting Fees Income	207,000	218,000
Operating Lease, Lease Income	19,000	10,000
Accounts and Other Receivables, Net, Current	350,000	271,000
Investment, Principal Repayments Recievable		750,000
HIVE Blockchain Technologies Ltd. [Member] | Warrants and Convertible Debentures [Member]
Accounts Receivable, Allowance for Credit Loss, Current	$ 0	$ 0