Note 17 - Related Party Transactions (Details Textual) - USD ($)		12 Months Ended
	Jan. 01, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022	Jan. 31, 2024	Jan. 12, 2021
Equity Securities, FV-NI		$ 10,885,000	$ 13,205,000
Equity Securities, FV-NI, Realized Gain (Loss)		(6,845,000)	(453,000)
Investment Owned, Fair Value		15,500,000
Realized Gain (Loss) on Principal Payment Proceeds		1,100,000	1,700,000
Investment Income, Net		2,144,000	316,000
Equity Securities without Readily Determinable Fair Value, Amount		1,687,000	2,388,000
Operating Lease, Lease Income		101,000	125,000
Warrant [Member]
Equity Securities, FV-NI			290,000			$ 5,900,000
HIVE Blockchain Technologies Ltd. [Member]
Investment Owned, Fair Value		4,400,000	7,300,000
Realized Gain (Loss) on Principal Payment Proceeds		1,100,000	1,700,000
Investment Income, Net		854,000	1,200,000
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		3,000,000
The Sonar Company [Member]
Equity Securities without Readily Determinable Fair Value, Amount		362,000	362,000
Operating Lease, Lease Income		8,000	16,000
Receivables From Mutual Funds [Member]
Receivables, Net, Current		772,000	1,100,000
U S Global Investors Funds [Member]
Equity Securities, FV-NI		10,500,000	12,400,000
Proceeds from Sale of Short-Term Investments		2,000	350,000
Equity Securities, FV-NI, Realized Gain (Loss)		(71,000)	(13,000)
Investment Income, Dividends and Capital Gains		380,000	267,000
HIVE Blockchain Technologies Ltd. [Member]
Consulting Fees Income		150,000		$ 120,000
Accounts Receivable, after Allowance for Credit Loss		$ 207,000	$ 43,000