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Note 2 - Investments (Details Textual) $ / shares in Units, shares in Millions |  | 3 Months Ended | 15 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 12, 2021 USD ($) | Sep. 30, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) $ / shares | Jun. 30, 2024 USD ($) | Mar. 31, 2021 shares | Jan. 31, 2021 USD ($) $ / shares | Jan. 31, 2021 $ / shares
Investment Owned, Fair Value |  |  | $ 14,900,000 |  | $ 14,900,000 |  |  |  |
Investment Owned, Cost |  |  | $ 17,500,000 |  | $ 17,500,000 |  |  |  |
Value of Fair Value Investments to Company Assets, Percent |  |  | 29.20% |  | 29.20% |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | $ 1,687,000 | $ 1,613,000 | $ 1,687,000 | $ 1,687,000 |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | [1] |  | 891,000 |  | 891,000 | 868,000 |  |  |
Debt Securities, Available-for-Sale, Total | [2] |  | 3,742,000 |  | 3,742,000 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax |  |  | 18,000 | 51,000 |  |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Period Increase (Decrease) |  |  | (23,000) |  | (27,000) |  |  |  |
Debt Securities, Available-for-Sale, Periodic Principal Payments |  |  | 750,000 |  |  |  |  |  |
Interest Receivable |  |  | 25,000 |  | 25,000 | 13,000 |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |  |  | 5,000,000 |  | 5,000,000 | 1,700,000 |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount |  |  |  |  |  | 2,500,000 |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  | 203,000 | 336,000 |  |  |  |  |
Equity Securities Without Readily Determinable Fair Values, Unrealized Gain (Loss) |  |  |  | $ 775,000 |  |  |  |  |
U S Global Investors Funds [Member] |  |  |  |  |  |  |  |  |
Investment Owned, Fair Value |  |  | 10,600,000 |  | 10,600,000 | 10,500,000 |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member] |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Principal Amount |  |  | 3,800,000 |  | 3,800,000 |  |  | $ 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 |  |  | 3,700,000 |  | 3,700,000 | 4,400,000 |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Total |  |  | $ 3,700,000 |  | $ 3,700,000 | 4,400,000 |  |  |
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) | $ / shares |  |  | $ 11.7 |  | $ 11.7 |  |  | $ 2.34 |
HIVE Blockchain Technologies Ltd. [Member] | Common Shares Purchase Warrants [Member] |  |  |  |  |  |  |  |  |
Investment, Common Share Purchase Warrants (in shares) | shares |  |  |  |  |  |  | 5 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 3
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 |  |  |  |
Investment Owned, Direct Percentage |  |  | 2.80% |  | 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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