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Note 2 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Jun. 30, 2024
--- | --- | ---
Fair value |  | $ 10,791 |  | $ 10,885 |
Total investments in trading securities: |  | 10,950 |  | 11,093 |
Investments in debt securities | [1] | 3,037 |  |  |
Corporate Debt Securities [Member] |  |  |  |  |
Corporate debt securities, fair value |  | 159 |  | 208 |
Convertible Debt Securities [Member] |  |  |  |  |
Investments in debt securities |  | 3,037 |  | 4,414 |
Fair Value, Recurring [Member] |  |  |  |  |
Total investments carried at fair value |  | 13,987 |  | 15,507 |
Fair Value, Nonrecurring [Member] |  |  |  |  |
Total investments carried at fair value |  | 0 | [2] | 600 | [3]
Equity Securities International [Member] |  |  |  |  |
Fair value |  | 326 |  | 435 |
Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 326 |  | 435 |
Exchange Traded Funds Global Equity [Member] |  |  |  |  |
Fair value |  | 5 |  |  |
Mutual Funds Fixed Income [Member] |  |  |  |  |
Fair value |  | 9,671 |  | 9,644 |
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 9,671 |  | 9,644 |
Mutual Funds Global Equity [Member] |  |  |  |  |
Fair value |  | 789 |  | 806 |
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 789 |  | 806 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value |  | 10,791 |  | 10,885 |
Total investments in trading securities: |  | 10,950 |  | 11,093 |
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Corporate debt securities, fair value |  | 159 |  | 208 |
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 |  | 10,950 |  | 11,093 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total investments carried at fair value |  | 0 | [2] | 0 | [3]
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 326 |  | 435 |
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Global Equity [Member] |  |  |  |  |
Fair value |  | 5 |  |  |
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 9,671 |  | 9,644 |
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 789 |  | 806 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value |  | 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 |  | 0 | [2] | 0 | [3]
Fair Value, Inputs, Level 2 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds Global Equity [Member] |  |  |  |  |
Fair value |  | 0 |  |  |
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value |  | 0 |  | 0 |
Total investments in trading securities: |  | 0 |  | 0 |
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 |  | 3,037 |  | 4,414 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Total investments carried at fair value |  | 3,037 |  | 4,414 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total investments carried at fair value |  | 0 | [2] | 600 | [3]
Fair Value, Inputs, Level 3 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds Global Equity [Member] |  |  |  |  |
Fair value |  | 0 |  |  |
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair value |  | $ 0 |  | $ 0 |
[1] | Principal payments of $750,000 are due quarterly with a final maturity in January 2026.
[2] | Other investments include equity securities without readily determinable fair values that are adjusted as a result of the measurement alternative. There were no adjustments during the six months ended December 31, 2024.
[3] | Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative on dates during the fiscal year ended June 30, 2024. 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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