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Note 3 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Jun. 30, 2024
--- | --- | ---
Fair value |  | $ 12,126 | $ 10,885
Total investments in trading securities: |  | 12,188 | 11,093
Investments in debt securities | [1] | 1,576 |
Corporate Debt Securities [Member] |  |  |
Corporate debt securities, fair value |  | 62 | 208
Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | 1,576 | 4,414
Fair Value, Recurring [Member] |  |  |
Total investments carried at fair value |  | 13,764 | 15,507
Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | [2] | 189 | 600
Equity Securities Domestic [Member] |  |  |
Fair value |  | 27 | 0
Equity Securities Domestic [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 27 | 0
Equity Securities International [Member] |  |  |
Fair value |  | 426 | 435
Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 426 | 435
Exchange Traded Funds Crypto and Digital Asset [Member] |  |  |
Fair value |  | 997 | 0
Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 997 | 0
Exchange Traded Funds Global Equity [Member] |  |  |
Fair value |  | 32 | 0
Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 32 | 0
Exchange Traded Funds Option Strategy and Income [Member] |  |  |
Fair value |  | 111 | 0
Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 111 | 0
Mutual Funds Fixed Income [Member] |  |  |
Fair value |  | 9,692 | 9,644
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 9,692 | 9,644
Mutual Funds Global Equity [Member] |  |  |
Fair value |  | 841 | 806
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 841 | 806
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value |  | 12,126 | 10,885
Total investments in trading securities: |  | 12,188 | 11,093
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Corporate debt securities, fair value |  | 62 | 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 |  | 12,188 | 11,093
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 Domestic [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 27 | 0
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 426 | 435
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 997 | 0
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 32 | 0
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 111 | 0
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 9,692 | 9,644
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 841 | 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 | [2] | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 0 | 0
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 Crypto and Digital Asset [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 0 | 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 |  | 1,576 | 4,414
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Total investments carried at fair value |  | 1,576 | 4,414
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | [2] | 189 | 600
Fair Value, Inputs, Level 3 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 0 | 0
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 Crypto and Digital Asset [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 0 | 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] | Fair value information is not as of June 30, 2024. Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative during the 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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