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Note 3 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | ---
Investments in equity securities |  | $ 11,297 | $ 13,205
Total investments in trading securities: |  | 11,557 | 13,205
Investments in debt securities | [1] | 5,784 |
Corporate Debt Securities [Member] |  |  |
Corporate debt securities, fair value |  | 260 | 0
Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | 5,784 | 7,008
Fair Value, Recurring [Member] |  |  |
Total investments carried at fair value |  | 17,341 | 20,213
Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | [2] | 435 | 1,786
Equity Securities International [Member] |  |  |
Investments in equity securities |  | 445 | 778
Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 445 | 778
Mutual Funds Fixed Income [Member] |  |  |
Investments in equity securities |  | 10,092 | 11,642
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 10,092 | 11,642
Mutual Funds Global Equity [Member] |  |  |
Investments in equity securities |  | 760 | 785
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 760 | 785
Fair Value, Inputs, Level 1 [Member] |  |  |
Investments in equity securities |  | 11,295 | 12,915
Total investments in trading securities: |  | 11,555 | 12,915
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Corporate debt securities, fair value |  | 260 | 0
Fair Value, Inputs, Level 1 [Member] | Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Total investments carried at fair value |  | 11,555 | 12,915
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | [2] | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 443 | 488
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 10,092 | 11,642
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 760 | 785
Fair Value, Inputs, Level 2 [Member] |  |  |
Investments in equity securities |  | 0 | 0
Total investments in trading securities: |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Corporate debt securities, fair value |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Total investments carried at fair value |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | [2] | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Investments in equity securities |  | 2 | 290
Total investments in trading securities: |  | 2 | 290
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |
Corporate debt securities, fair value |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | 5,784 | 7,008
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Total investments carried at fair value |  | 5,786 | 7,298
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | [2] | 435 | 1,786
Fair Value, Inputs, Level 3 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 2 | 290
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities |  | $ 0 | $ 0
[1] | Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.
[2] | Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative on dates during the three months ended September 30, 2022. These securities are classified as level 3 due to the infrequency of the observable price changes and/or restrictions on the shares.

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