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Note 17 - Related Party Transactions (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jul. 01, 2018
Equity Securities, FV-NI, Total | $ 14,300,000 | $ 18,258,000 |
Payments to Acquire Short-Term Investments | 6,000,000 | (0) |
Equity Securities, FV-NI, Realized Gain (Loss), Total | 1,848,000 | 16,566,000 |
Other Accrued Liabilities, Current | 1,831,000 | 1,345,000 |
Investment Owned, Fair Value | 24,900,000 |  |
Realized Gain (Loss) on Principal Payment Proceeds | 2,200,000 | 1,200,000 |
Retained Earnings (Accumulated Deficit), Total | 36,302,000 | 33,833,000 |
Equity Securities, FV-NI, Cost | 19,967,000 | 14,363,000 |
Investment Income, Net, Total | (6,174,000) | 28,338,000 |
Accounts and Other Receivables, Net, Current | 1,796,000 | 2,534,000 |
Equity Securities without Readily Determinable Fair Value, Amount | 3,992,000 | 3,453,000 |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount | 187,000 | 1,561,000 |
Reclassified of Unrealized Gains Related to Investment From Accumulated Other Comprehensive Income (Loss) to Retained Earnings [Member] |  |  |
Retained Earnings (Accumulated Deficit), Total |  |  | $ 3,200,000
HIVE Blockchain Technologies Ltd. [Member] |  |  |
Investment Owned, Fair Value | 11,100,000 | 25,100,000 |
Proceeds from Sale of Debt Securities, Available-for-Sale | 3,000,000.0 | 1,400,000 |
Realized Gain (Loss) on Principal Payment Proceeds | 2,200,000 | 1,200,000 |
Proceeds from Sale of Long-Term Investments |  | 20,600,000 |
Equity Securities, FV-NI, Cost |  | 2,400,000 |
Equity Securities, FV-NI, Realized Gain |  | 15,000,000.0 |
Thunderbird Entertainment Group [Member] |  |  |
Equity Securities, FV-NI, Total |  | 2,700,000 |
Equity Securities, FV-NI, Realized Gain | 1,900,000 | 936,000 |
The Sonar Company [Member] |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | 362,000 | 100,000 |
Payments to Acquire Equity Securities Without Readily Determinable Fair Value | 75,000 |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount | 187,000 |  |
Operating Lease, Lease Income, Total | 15,000 | 0 |
Receivables From Mutual Funds [Member] |  |  |
Receivables, Net, Current, Total | 1,600,000 | 2,400,000 |
U S Global Investors Funds [Member] |  |  |
Equity Securities, FV-NI, Total | 12,800,000 | 7,300,000 |
Payments to Acquire Short-Term Investments | 6,000,000.0 |  |
Investment Income, Dividends and Capital Gains | 146,000 | 15,000 |
Equity Securities, FV-NI, Realized Gain (Loss), Total | 0 | 0 |
Mutual Funds [Member] |  |  |
Other Accrued Liabilities, Current | 110,000 |  |
HIVE Blockchain Technologies Ltd. [Member] |  |  |
Investment Income, Net, Total | 1,600,000 | 368,000 |
Consulting Fees Income | 120,000 | 40,000 |
Accounts and Other Receivables, Net, Current | $ 140,000 | $ 40,000 |

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