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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 |  |  |

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