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v3.22.2.2

Note 2 - Investments (Details Textual) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) shares | Mar. 31, 2021 USD ($) $ / shares | Jun. 30, 2022 USD ($) | Sep. 30, 2022 $ / shares | Mar. 31, 2021 $ / shares
Investment Owned, at Fair Value | $ 27,000,000.0 |  |  |  |  |  |
Investment Owned, at Cost | $ 28,400,000 |  |  |  |  |  |
Value of Fair Value Investments to Company Assets, Percent | 45.60% |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 2,630,000 |  | $ 3,453,000 |  | $ 3,992,000 |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | 1,000,000.0 |  |  |  |  |  |
Equity Securities, FV-NI, Total | 16,346,000 |  |  |  | 16,428,000 |  |
Debt Securities, Available-for-Sale, Total | 10,686,000 | [1] |  |  | 11,449,000 |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | (120,000) |  | (147,000) |  |  |  |
Investment Income, Net, Total | (1,447,000) |  | (34,000) |  |  |  |
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | 202,000 | [2] |  |  | 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 |  |  |  | 4,000,000.0 |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount | 3,300,000 |  |  |  |  |  |
Income (Loss) from Equity Method Investments | 0 |  | 15,000 |  |  |  |
Realized Gain (Loss) on Principal Payment Proceeds | 469,000 |  | 602,000 |  |  |  |
Equity Securities Without Readily Determinable Fair Values, Unrealized Gain (Loss) | 1,800,000 |  | 0 |  |  |  |
U S Global Investors Funds [Member] |  |  |  |  |  |  |
Investment Owned, at Fair Value | 12,600,000 |  |  |  | 12,800,000 |  |
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member] |  |  |  |  |  |  |
Investment Owned, Balance, Principal Amount | 9,800,000 |  |  | $ 15,000,000.0 |  |  |
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, at Fair Value | 13,400,000 |  |  |  | 14,100,000 |  |
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] |  |  |  |  |  |  |
Debt Securities, Available-for-Sale, Total | $ 10,700,000 |  |  | 16,000,000.0 | 11,400,000 |  |
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] | Convertible Debt Securities [Member] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.00% |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | $ 11.70 |  |  | $ 2.34 |  |  |
Investment Income, Net, Total | $ 469,000 |  | $ 602,000 |  |  |  |
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 |  |  |  |  |  | $ 15.00 | $ 3.00
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares | 5 |  |  |  |  |  |
Equity Securities, FV-NI, Total | $ 2,700,000 |  |  | $ 5,900,000 | 2,600,000 |  |
Thunderbird Entertainment Group [Member] |  |  |  |  |  |  |
Equity Securities, Shares Sold (in shares) | shares |  |  | 779,000 |  |  |  |
Equity Securities, FV-NI, Realized Gain |  |  | $ 1,800,000 |  |  |  |
The Sonar Company [Member] |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | 362,000 |  |  |  |  |  |
Other Investments and Securities, at Cost | $ 175,000 |  |  |  |  |  |
Investment Owned, Direct Percentage | 2.80% |  |  |  |  |  |
Galileo New Economy Fund L P [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 22.00% |  |  |  |
Income (Loss) from Equity Method Investments |  |  | $ 15,000 |  |  |  |
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] | 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, and the fair value is classified as Level 2 according to the fair value hierarchy.

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