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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 |  |

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