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Note 4 - Investments (Details Textual) - USD ($) $ / shares in Units, shares in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2024 | Jan. 12, 2021 | Jan. 31, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2021 | Jan. 31, 2021
Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Investment Income, Net |  |  |  |  | $ 2,144,000 | $ 316,000 |  |  |
Investment Owned, Fair Value |  |  |  |  | 15,500,000 |  |  |  |
Investment Owned, Cost |  |  |  |  | $ 18,000,000 |  |  |  |
Value of Fair Value Investments to Company Assets, Percent |  |  |  |  | 29.80% |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  |  |  | $ 1,687,000 | 2,388,000 |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | [1] |  |  |  | 868,000 | 1,000,000 |  |  |
Debt Securities, Available-for-Sale, Total | [2] |  |  |  | 4,414,000 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax |  |  |  |  | 136,000 | (961,000) |  |  |
Equity Securities, FV-NI |  |  |  |  | 10,885,000 | 13,205,000 |  |  |
Equity Securities, FV-NI |  |  |  |  | 10,885,000 | 13,205,000 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  |  |  | (102,000) |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax |  |  |  |  | 172,000 |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Period Increase (Decrease) |  |  |  |  | (100,000) |  |  |  |
Debt Securities, Available-for-Sale, Periodic Principal Payments |  |  |  |  | 750,000 |  |  |  |
Interest Receivable |  |  |  |  | 13,000 |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount |  |  |  |  | 2,500,000 |  |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |  |  |  |  | 5,000,000 |  |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  |  |  | 1,100,000 | 1,700,000 |  |  |
Equity Securities Without Readily Determinable Fair Values, Unrealized Gain (Loss) |  |  |  |  | $ (1,000,000) | (2,300,000) |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  | Investment Income, Net |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI |  |  |  |  | $ 0 | 290,000 |  |  |
Equity Securities, FV-NI |  |  |  |  | 0 | 290,000 |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI |  |  | $ 5,900,000 |  |  | 290,000 |  |  |
Equity Securities, FV-NI |  |  | 5,900,000 |  |  | 290,000 |  |  |
Warrant [Member] | Investment Income, Net |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Realized Loss |  |  |  | $ 5,900,000 |  |  |  |  |
U S Global Investors Funds [Member] |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  |  |  |  | 10,500,000 | 12,400,000 |  |  |
HIVE Blockchain Technologies Ltd. [Member] |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Investment Income, Net |  |  |  |  | 854,000 | 1,200,000 |  |  |
Investment Owned, Fair Value |  |  |  |  | 4,400,000 | 7,300,000 |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  |  |  | 1,100,000 | 1,700,000 |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member] |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Principal Amount |  |  |  |  | 4,600,000 |  |  |  | $ 15,000,000
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 |  |  |  |  | 4,400,000 | 7,300,000 |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Total |  |  |  |  | $ 4,400,000 | 7,000,000 |  |  |
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] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Total |  |  | $ 16,000,000 |  |  |  |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] | Convertible Debt Securities [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 8.00% |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  | $ 11.7 |  |  |  | $ 2.34
HIVE Blockchain Technologies Ltd. [Member] | Common Shares Purchase Warrants [Member] |  |  |  |  |  |  |  |  |
Investment, Common Share Purchase Warrants (in shares) |  |  |  |  |  |  |  | 5 |
HIVE Blockchain Technologies Ltd. [Member] | Warrant [Member] |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI |  |  |  | 5,900,000 |  |  |  |  |
Equity Securities, FV-NI |  |  |  | $ 5,900,000 |  |  |  |  |
Equity Securities, FV-NI, Realized Loss |  | $ 5,900,000 |  |  |  |  |  |  |
The Sonar Company [Member] |  |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  |  |  | $ 362,000 | $ 362,000 |  |  |
Other Investments and Securities, at Cost |  |  |  |  | $ 175,000 |  |  |  |
Investment Owned, Direct Percentage |  |  |  |  |  |  | 2.80% |  |
[1] | Held-to-maturity debt instruments are carried at amortized cost, net of allowance for credit losses, and the fair value is classified as Level 2 according to the fair value hierarchy.
[2] | Principal payments of $750,000 are due quarterly with a final maturity in January 2026.

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