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Note 4 - Investments (Details Textual) $ / shares in Units, shares in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 12, 2021 USD ($) | Jun. 30, 2023 USD ($) shares | Jun. 30, 2023 USD ($) shares | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2023 $ / shares | Jun. 30, 2021 $ / shares shares
Investment Owned, Fair Value |  |  | $ 20,200,000 |  | $ 20,200,000 |  |  |  |  |
Investment Owned, Cost |  |  | $ 27,300,000 |  | $ 27,300,000 |  |  |  |  |
Value of Fair Value Investments to Company Assets, Percent |  |  | 36.30% |  | 36.30% |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | $ 2,388,000 |  | $ 2,388,000 |  | $ 3,992,000 |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total |  |  | 1,000,000 |  | 1,000,000 |  | 1,000,000 |  |  |
Equity Securities, FV-NI, Total |  |  | 13,205,000 |  | 13,205,000 |  | 14,300,000 |  |  |
Debt Securities, Available-for-Sale, Total | [1] |  | 7,008,000 | [2] | 7,008,000 | [2] | 10,625,000 |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax |  |  |  |  | (961,000) |  | (1,209,000) |  |  |
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | [3] |  | 232,000 |  | 232,000 |  | 133,000 |  |  |
Debt Securities, Available-for-Sale, Periodic Principal Payments |  |  | 750,000 |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount |  |  | 2,500,000 |  | 2,500,000 |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |  |  | 3,800,000 |  | 3,800,000 |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount |  |  |  |  | 14,000 |  | 187,000 |  |  |
Income (Loss) from Equity Method Investments |  |  |  |  | 0 |  | (206,000) |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  |  |  | 1,700,000 |  | 2,200,000 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  |  |  |  | (0) |  | 10,000 |  |  |
Equity Securities Without Readily Determinable Fair Values, Unrealized Gain (Loss) |  |  |  |  | (2,300,000) |  | 187,000 |  |  |
U S Global Investors Funds [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  |  | 12,400,000 |  | 12,400,000 |  | 12,800,000 |  |  |
HIVE Blockchain Technologies Ltd. [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  |  | 7,300,000 |  | 7,300,000 |  | 11,100,000 |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  |  |  | 1,700,000 |  | 2,200,000 |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Principal Amount |  | $ 15,000,000 | 7,600,000 |  | 7,600,000 |  |  |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Warrants and Convertible Debentures [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities and Equity Securities [Member] |  |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  |  | 7,300,000 |  | 7,300,000 |  | 11,100,000 |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Total |  | 16,000,000 | $ 7,000,000 |  | $ 7,000,000 |  | $ 10,600,000 |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax |  | 6,900,000 |  |  |  |  |  |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] | Convertible Debt Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 8.00% |  | 8.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 11.7 | $ 2.34 |  |
HIVE Blockchain Technologies Ltd. [Member] | Common Shares Purchase Warrants [Member] |  |  |  |  |  |  |  |  |  |
Investment, Common Share Purchase Warrants (in shares) | shares |  |  | 5 |  | 5 |  |  | 5 |  | 5
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 15 | $ 3
Equity Securities, FV-NI, Total |  | $ 5,900,000 | $ 290,000 |  | $ 290,000 |  | $ 515,000 |  |  |
The Sonar Company [Member] |  |  |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | 362,000 |  | 362,000 |  | 362,000 |  |  |
Other Investments and Securities, at Cost |  |  | $ 175,000 |  | $ 175,000 |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount |  |  |  |  |  |  | 187,000 |  |  |
Investment Owned, Direct Percentage |  |  | 2.80% |  | 2.80% |  |  |  |  |
Galileo New Economy Fund L P [Member] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 22.00% |  | 22.00%
Income (Loss) from Equity Method Investments |  |  |  |  |  |  | (206,000) |  |  |
Galileo New Economy Fund L P [Member] | Cash [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Equity Method Investment, Distribution, Return of Capital |  |  |  |  |  |  |  | $ 85,000 |  |
Galileo New Economy Fund L P [Member] | Common Shares [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Equity Method Investment, Distribution, Return of Capital |  |  |  |  |  |  | $ 228,000 |  |  |
[1] | Changes in unrealized gains and losses are included in the statement of comprehensive income (loss), except for embedded derivatives. Changes in unrealized and realized gains and losses for embedded derivatives are included in earnings in the statement of operations.
[2] | Principal payments of $750,000 are due quarterly with a final maturity in January 2026.
[3] | Held-to-maturity debt instruments are carried at amortized cost, and the fair value is classified as Level 2 according to the fair value hierarchy.

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