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Note 4 - Investments - Components of Investments (Details) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cost |  | $ 11,605,000 |  | $ 19,601,000
Unrealized gains (losses) |  | (720,000) |  | (6,396,000)
Equity Securities, FV-NI |  | 10,885,000 |  | 13,205,000
Corporate debt securities, Unrealized gains (losses) |  | (7,000) |  | 0
Total trading securities at fair value, cost |  | 11,820,000 |  | 19,601,000
Total trading securities at fair value, Unrealized gains (losses) |  | (727,000) |  | (6,396,000)
Total trading securities at fair value |  | 11,093,000 |  | 13,205,000
Amortized cost |  | 6,204,000 | [1] | 7,729,000
Debt Securities, Available-for-Sale, Total | [1] | 4,414,000 |  |
Allowance for credit losses |  | 0 |  | 0
Corporate debt securities | [2] | 1,000,000 |  | 1,000,000
Corporate debt securities | [2] | 132,000 |  | 0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | [2] | 868,000 |  | 1,000,000
Corporate debt securities | [2] | 0 |  | 0
Corporate debt securities | [2] | 0 |  | (232,000)
Corporate debt securities | [2] | 868,000 |  | 768,000
Convertible Debt Securities [Member] |  |  |  |
Amortized cost |  | 6,204,000 |  | 7,729,000
Gross unrealized gains in other comprehensive income (loss) |  | 740,000 |  | 1,707,000
Gross unrealized losses in other comprehensive income (loss) |  | 0 |  | 0
Gross unrealized losses in net investment income (loss) | [3] | (2,530,000) |  | (2,428,000)
Debt Securities, Available-for-Sale, Total |  | 4,414,000 |  | 7,008,000
Allowance for credit losses |  | 0 |  | 0
Corporate Debt Securities [Member] |  |  |  |
Corporate debt securities, cost |  | 215,000 |  | 0
Corporate debt securities, Unrealized gains (losses) |  | (7,000) |  | 0
Corporate debt securities, fair value |  | 208,000 |  | 0
Equity Securities International [Member] |  |  |  |
Cost |  | 762,000 |  | 6,679,000
Unrealized gains (losses) |  | (327,000) |  | (5,901,000)
Equity Securities, FV-NI |  | 435,000 |  | 778,000
Equity Securities Domestic [Member] |  |  |  |
Cost |  | 45,000 |  | 45,000
Unrealized gains (losses) |  | (45,000) |  | (45,000)
Equity Securities, FV-NI |  | 0 |  | 0
Mutual Funds Fixed Income [Member] |  |  |  |
Cost |  | 9,869,000 |  | 11,947,000
Unrealized gains (losses) |  | (225,000) |  | (305,000)
Equity Securities, FV-NI |  | 9,644,000 |  | 11,642,000
Mutual Funds Global Equity [Member] |  |  |  |
Cost |  | 929,000 |  | 930,000
Unrealized gains (losses) |  | (123,000) |  | (145,000)
Equity Securities, FV-NI |  | $ 806,000 |  | $ 785,000
[1] | Principal payments of $750,000 are due quarterly with a final maturity in January 2026.
[2] | 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.
[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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