Note 16 - Related Party Transactions (Details Textual) - USD ($)		12 Months Ended
	Jan. 01, 2024	Jun. 30, 2025	Jun. 30, 2024	Jan. 31, 2024	Jan. 12, 2021
Equity Securities, FV-NI		$ 12,126,000	$ 10,885,000
Equity Securities, FV-NI, Realized Gain (Loss)		(192,000)	(6,845,000)
Payments to Acquire Equity Securities, FV-NI		1,246,000	234,000
Investment Owned, Fair Value		13,800,000
Realized Gain (Loss) on Principal Payment Proceeds		610,000	1,100,000
Investment Income, Net		2,393,000	2,144,000
Operating Lease, Lease Income		104,000	101,000
Accounts and Other Receivables, Net, Current		1,036,000	1,047,000
Equity Securities without Readily Determinable Fair Value, Amount		1,349,000	1,687,000
Warrant [Member]
Equity Securities, FV-NI					$ 5,900,000
HIVE Blockchain Technologies Ltd. [Member]
Payments to Acquire Equity Securities, FV-NI		41,000
Investment Owned, Fair Value		1,600,000	4,400,000
Realized Gain (Loss) on Principal Payment Proceeds		610,000	1,100,000
Investment Income, Net		$ 457,000	854,000
HIVE Blockchain Technologies Ltd. [Member] | Maximum [Member]
Equity Method Investment, Ownership Percentage		1.00%
HIVE Blockchain Technologies Ltd. [Member] | Warrant [Member]
Equity Securities, FV-NI				$ 5,900,000
Equity Securities, FV-NI, Realized Loss	$ 5,900,000
HIVE Blockchain Technologies Ltd. [Member] | Convertible Debt Securities [Member]
Proceeds from Sale, Maturity and Collection of Investments		$ 2,300,000	3,000,000
The Sonar Company [Member]
Operating Lease, Lease Income		$ 0	8,000
Investment Owned, Direct Percentage		2.80%
Equity Securities without Readily Determinable Fair Value, Amount		$ 0	362,000
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount		(175,000)
Receivables From Mutual Funds [Member]
Receivables, Net, Current		683,000	772,000
U S Global Investors Funds [Member]
Equity Securities, FV-NI		10,500,000	10,500,000
Proceeds from Sale of Equity Securities, FV-NI		0	2,000,000
Equity Securities, FV-NI, Realized Gain (Loss)			(71,000)
Investment Income, Dividends and Capital Gains		406,000	380,000
US Global ETF Clients [Member]
Equity Securities, FV-NI		32,000	0
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		109,000
Payments for (Proceeds from) Short-Term Investments			0
HIVE Blockchain Technologies Ltd. [Member]
Receivables, Net, Current		1,000,000
Consulting Fees Income		218,000	150,000
Operating Lease, Lease Income		10,000
Accounts and Other Receivables, Net, Current		271,000	207,000
Investment, Principal Repayments Recievable		$ 750,000
HIVE Blockchain Technologies Ltd. [Member] | Warrants and Convertible Debentures [Member]
Accounts and Other Receivables, Net, Current			$ 0