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Note 3 - Investments - Components of Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2023
Cost |  | $ 17,849,000 |  |  | $ 17,849,000 |  |  | $ 19,601,000
Unrealized gains losses |  | (6,552,000) |  |  | (6,552,000) |  |  |
Investments in equity securities |  | 11,297,000 |  |  | 11,297,000 |  |  | 13,205,000
Corporate debt securities |  | 46,000 |  | $ 0 | 46,000 |  | $ 0 |
Total trading securities at fair value |  | 18,064,000 |  |  | 18,064,000 |  |  | 19,601,000
Total trading securities at fair value |  | (6,507,000) |  |  | (6,507,000) |  |  | (6,396,000)
Total trading securities at fair value |  | 11,557,000 |  |  | 11,557,000 |  |  | 13,205,000
Unrealized gains (losses) on equity securities |  | 279,000 |  | $ (937,000) | (164,000) |  | $ (2,868,000) | (6,396,000)
Amortized cost |  | 7,056,000 | [1] |  | 7,056,000 | [1] |  | 7,729,000
Debt Securities, Available-for-Sale, Total | [1] | 5,784,000 |  |  | 5,784,000 |  |  |
Allowance for credit losses |  | 0 |  |  | 0 |  |  | 0
Corporate debt securities, cost |  | 1,000,000 | [2] |  | 1,000,000 | [2] |  | 1,000,000
Corporate debt securities, gains |  | 0 | [2] |  | 0 | [2] |  | 0
Corporate debt securities, losses |  | (177,000) | [2] |  | (177,000) | [2] |  | (232,000)
Corporate debt securities, fair value |  | 823,000 | [2] |  | 823,000 | [2] |  | 768,000
Corporate debt securities |  | 177,000 | [2] |  | 177,000 | [2] |  | 0
Convertible Debt Securities [Member] |  |  |  |  |  |  |  |
Amortized cost |  | 7,056,000 |  |  | 7,056,000 |  |  | 7,729,000
Gross unrealized gains in other comprehensive income (loss) |  | 1,219,000 |  |  | 1,219,000 |  |  | 1,707,000
Gross unrealized losses in other comprehensive income (loss) |  | 0 |  |  | 0 |  |  | 0
Gross unrealized losses in net investment income (loss) |  | (2,491,000) |  |  | (2,491,000) |  |  | (2,428,000)
Debt Securities, Available-for-Sale, Total |  | 5,784,000 |  |  | 5,784,000 |  |  | 7,008,000
Allowance for credit losses |  | 0 |  |  | 0 |  |  | 0
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Corporate debt securities, cost |  | 215,000 |  |  | 215,000 |  |  | 0
Corporate debt securities |  |  |  |  | 45,000 |  |  |
Corporate debt securities, fair value |  | 260,000 |  |  | 260,000 |  |  | 0
Total trading securities at fair value |  |  |  |  |  |  |  | 0
Equity Securities International [Member] |  |  |  |  |  |  |  |
Cost |  | 6,595,000 |  |  | 6,595,000 |  |  | 6,679,000
Unrealized gains losses |  | (6,150,000) |  |  | (6,150,000) |  |  |
Investments in equity securities |  | 445,000 |  |  | 445,000 |  |  | 778,000
Unrealized gains (losses) on equity securities |  |  |  |  |  |  |  | (5,901,000)
Equity Securities Domestic [Member] |  |  |  |  |  |  |  |
Cost |  | 45,000 |  |  | 45,000 |  |  | 45,000
Unrealized gains losses |  | (45,000) |  |  | (45,000) |  |  |
Investments in equity securities |  | 0 |  |  | 0 |  |  | 0
Unrealized gains (losses) on equity securities |  |  |  |  |  |  |  | (45,000)
Mutual Funds Fixed Income [Member] |  |  |  |  |  |  |  |
Cost |  | 10,280,000 |  |  | 10,280,000 |  |  | 11,947,000
Unrealized gains losses |  | (188,000) |  |  | (188,000) |  |  |
Investments in equity securities |  | 10,092,000 |  |  | 10,092,000 |  |  | 11,642,000
Unrealized gains (losses) on equity securities |  |  |  |  |  |  |  | (305,000)
Mutual Funds Global Equity [Member] |  |  |  |  |  |  |  |
Cost |  | 929,000 |  |  | 929,000 |  |  | 930,000
Unrealized gains losses |  | (169,000) |  |  | (169,000) |  |  |
Investments in equity securities |  | $ 760,000 |  |  | $ 760,000 |  |  | 785,000
Unrealized gains (losses) on equity securities |  |  |  |  |  |  |  | $ (145,000)
[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, net of allowance for credit losses, and the fair value is classified as Level 2 according to the fair value hierarchy.

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