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Note 2 - Investments (Details Textual) - USD ($) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 12, 2021 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Mar. 31, 2021 | Jan. 31, 2021
Investment Owned, Fair Value |  |  | $ 13,600,000 |  |  |  |
Investment Owned, Cost |  |  | $ 16,300,000 |  |  |  |
Value of Fair Value Investments to Company Assets, Percent |  |  | 27.80% |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | $ 2,677,000 | $ 1,687,000 | $ 1,349,000 |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | [1] |  | 953,000 |  | 948,000 |  |
Debt Securities, Available-for-Sale, Total | [2] |  | 842,000 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax |  |  | (3,000) | 18,000 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Period Increase (Decrease) |  |  | 5,000 | 23,000 |  |  |
Debt Securities, Available-for-Sale, Periodic Principal Payments |  |  | 750,000 |  |  |  |
Interest Receivable |  |  | 35,000 |  | 40,000 |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |  |  | 1,300,000 |  | 5,400,000 |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount |  |  | 3,900,000 |  |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  | 71,000 | 203,000 |  |  |
Equity Securities Without Readily Determinable Fair Values, Unrealized Gain (Loss) |  |  | 1,300,000 | $ 0 |  |  |
U S Global Investors Funds [Member] |  |  |  |  |  |  |
Investment Owned, Fair Value |  |  | 10,600,000 |  | 10,500,000 |  |
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] |  |  |  |  |  |  |
Investment Owned, Balance, Principal Amount |  |  | 842,000 |  |  |  |
Debt Securities, Available-for-Sale, Total |  |  | $ 842,000 |  | 1,600,000 |  |
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] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Total |  | $ 16,000,000 |  |  |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Common Shares Purchase Warrants [Member] |  |  |  |  |  |  |
Investment, Common Share Purchase Warrants (in shares) |  |  |  |  |  | 5,000,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  | $ 3
HIVE Blockchain Technologies Ltd. [Member] | Common Stock [Member] |  |  |  |  |  |  |
Investment Owned, Net Assets, Percentage |  |  | 0.10% |  |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Investment Owned, Fair Value |  |  | $ 60,000 |  | $ 27,000 |  |
Investment Owned, Cost |  |  | $ 41,000 |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  | 15,000 |  |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member] |  |  |  |  |  |  |
Investment Owned, Balance, Principal Amount |  |  |  |  |  |  | $ 15,000,000
HIVE Blockchain Technologies Ltd. [Member] | Convertible Debt Securities [Member] | Unsecured Convertible Debentures [Member] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 8.00% |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  | $ 11.7 |  |  |  | $ 2.34
[1] | Held-to-maturity debt investments 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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