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Note 3 - Investments (Details Textual) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) | Mar. 31, 2024 $ / shares | Jun. 30, 2023 USD ($) | Mar. 31, 2021 $ / shares shares | Jan. 31, 2021 USD ($) $ / shares
Investment Owned, Fair Value |  |  | $ 16,700,000 |  | $ 16,700,000 |  |  |  |  |  |
Investment Owned, Cost |  |  | $ 18,900,000 |  | $ 18,900,000 |  |  |  |  |  |
Value of Fair Value Investments to Company Assets, Percent |  |  | 31.60% |  | 31.60% |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | $ 1,114,000 | $ 2,827,000 | $ 1,114,000 |  | $ 2,827,000 |  | $ 2,388,000 |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss |  |  | 843,000 |  | 843,000 |  |  |  |  |  |
Debt Securities, Available-for-Sale, Total | [1] |  | 5,190,000 |  | 5,190,000 |  |  |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax |  |  | 79,000 | 80,000 | 199,000 |  | (939,000) |  |  |  |
Equity Securities, FV-NI |  |  | 11,311,000 |  | 11,311,000 |  |  |  | 13,205,000 |  |
Equity Securities, FV-NI |  |  | 11,311,000 |  | 11,311,000 |  |  |  | 13,205,000 |  |
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | [2] |  | 157,000 |  | 157,000 |  |  |  | 232,000 |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Period Increase (Decrease) |  |  |  |  | (75,000) |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Credit Loss Expense (Reversal) |  |  | (20,000) |  | (75,000) | [3] | 0 |  |  |  |
Debt Securities, Available-for-Sale, Periodic Principal Payments |  |  |  |  | 750,000 |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |  |  | 5,000,000 |  | 5,000,000 |  |  |  | 2,400,000 |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount |  |  | 2,500,000 |  | 2,500,000 |  |  |  |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  | 267,000 | 394,000 | 906,000 |  | 1,300,000 |  |  |  |
Equity Securities Without Readily Determinable Fair Values, Unrealized Gain (Loss) |  |  | (240,000) | $ 0 | (1,000,000) |  | $ (1,800,000) |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI |  |  | 0 |  | 0 |  |  |  | 290,000 |  |
Equity Securities, FV-NI |  |  | 0 |  | 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 |  |  | 10,900,000 |  | 10,900,000 |  |  |  | 12,400,000 |  |
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Principal Amount |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  | 5,200,000 |  | 5,200,000 |  |  |  | 7,300,000 |  |
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Total |  |  | $ 5,200,000 |  | 5,200,000 |  |  |  | 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] | 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 |  |  |  |  |  |  |  |  |  | 5,000,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares |  |  |  |  |  |  |  | $ 15 |  | $ 3 |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares |  |  | 5 |  | 5 |  |  |  |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Common Shares Purchase Warrants [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Total |  |  | $ 16,000,000 |  | $ 16,000,000 |  |  |  |  |  |
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Principal Amount |  |  | 5,300,000 |  | 5,300,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Investment Owned, Direct Percentage |  |  | 2.80% |  | 2.80% |  |  |  |  |  |
[1] | Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.
[2] | 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.
[3] | Represents the change in present value attributable to the passage of time included in interest income.

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