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Note 3 - Investments - Components of Investments (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Cost |  | $ 12,748,000 |  | $ 11,605,000 |  |
Unrealized gains (losses) |  | (622,000) |  | (720,000) |  |
Fair value |  | 12,126,000 |  | 10,885,000 |  |
Corporate debt securities, Unrealized gains (losses) |  | (146,000) |  | (7,000) |  |
Total trading securities at fair value, cost |  | 12,963,000 |  | 11,820,000 |  |
Total trading securities at fair value, Unrealized gains (losses) |  | (775,000) |  | (727,000) |  |
Total trading securities at fair value |  | 12,188,000 |  | 11,093,000 |  |
Amortized cost |  | 3,993,000 | [1] | 6,204,000 |  |
Debt Securities, Available-for-Sale, Total | [1] | 1,576,000 |  |  |  |
Allowance for credit losses |  | 0 |  | 0 |  |
Corporate debt securities, amortized cost | [2] | 1,000,000 |  | 1,000,000 |  |
Corporate debt securities, allowance for credit losses |  | (52,000) | [2] | (132,000) | [2] | $ 0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | [2] | 948,000 |  | 868,000 |  |
Corporate debt securities, gross unrecognized holding gains | [2] | 0 |  | 0 |  |
Corporate debt securities, gross unrecognized holding losses | [2] | 0 |  | 0 |  |
Corporate debt securities, fair value | [2] | 948,000 |  | 868,000 |  |
Convertible Debt Securities [Member] |  |  |  |  |  |
Amortized cost |  | 3,993,000 |  | 6,204,000 |  |
Gross unrealized gains in other comprehensive income (loss) |  | 125,000 |  | 740,000 |  |
Gross unrealized losses in other comprehensive income (loss) |  | 0 |  | 0 |  |
Gross unrealized losses in net investment income (loss) | [3] | (2,542,000) |  | (2,530,000) |  |
Debt Securities, Available-for-Sale, Total |  | 1,576,000 |  | 4,414,000 |  |
Allowance for credit losses |  | 0 |  | 0 |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Corporate debt securities, cost |  | 215,000 |  | 215,000 |  |
Corporate debt securities, Unrealized gains (losses) |  | (153,000) |  | (7,000) |  |
Corporate debt securities, fair value |  | 62,000 |  | 208,000 |  |
Equity Securities Domestic [Member] |  |  |  |  |  |
Cost |  | 87,000 |  | 45,000 |  |
Unrealized gains (losses) |  | (60,000) |  | (45,000) |  |
Fair value |  | 27,000 |  | 0 |  |
Equity Securities International [Member] |  |  |  |  |  |
Cost |  | 761,000 |  | 762,000 |  |
Unrealized gains (losses) |  | (335,000) |  | (327,000) |  |
Fair value |  | 426,000 |  | 435,000 |  |
Exchange Traded Funds Crypto and Digital Asset [Member] |  |  |  |  |  |
Cost |  | 967,000 |  | 0 |  |
Unrealized gains (losses) |  | 30,000 |  | 0 |  |
Fair value |  | 997,000 |  | 0 |  |
Exchange Traded Funds Global Equity [Member] |  |  |  |  |  |
Cost |  | 30,000 |  | 0 |  |
Unrealized gains (losses) |  | 2,000 |  | 0 |  |
Fair value |  | 32,000 |  | 0 |  |
Exchange Traded Funds Option Strategy and Income [Member] |  |  |  |  |  |
Cost |  | 105,000 |  | 0 |  |
Unrealized gains (losses) |  | 6,000 |  | 0 |  |
Fair value |  | 111,000 |  | 0 |  |
Mutual Funds Fixed Income [Member] |  |  |  |  |  |
Cost |  | 9,869,000 |  | 9,869,000 |  |
Unrealized gains (losses) |  | (177,000) |  | (225,000) |  |
Fair value |  | 9,692,000 |  | 9,644,000 |  |
Mutual Funds Global Equity [Member] |  |  |  |  |  |
Cost |  | 929,000 |  | 929,000 |  |
Unrealized gains (losses) |  | (88,000) |  | (123,000) |  |
Fair value |  | $ 841,000 |  | $ 806,000 |  |
[1] | Principal payments of $750,000 are due quarterly with a final maturity 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 changes in unrealized gains and losses related to embedded derivatives included in net investment income (loss) in the Consolidated Statements of Operations.

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