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Note 2 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025
--- | --- | ---
Fair value |  | $ 12,723 | $ 12,126
Total investments in trading securities: |  | 12,774 | 12,188
Investments in debt securities | [1] | 842 |
Corporate Debt Securities [Member] |  |  |
Corporate debt securities, fair value |  | 51 | 62
Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | 842 | 1,576
Fair Value, Recurring [Member] |  |  |
Total investments carried at fair value |  | 13,616 | 13,764
Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | [2] | 1,828 | 189
Equity Securities Domestic [Member] |  |  |
Fair value |  | 60 | 27
Equity Securities Domestic [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 60 | 27
Equity Securities International [Member] |  |  |
Fair value |  | 847 | 426
Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 847 | 426
Exchange Traded Funds Crypto and Digital Asset [Member] |  |  |
Fair value |  | 992 | 997
Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 992 | 997
Exchange Traded Funds Global Equity [Member] |  |  |
Fair value |  | 34 | 32
Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 34 | 32
Exchange Traded Funds Option Strategy and Income [Member] |  |  |
Fair value |  | 166 | 111
Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 166 | 111
Mutual Funds Fixed Income [Member] |  |  |
Fair value |  | 9,734 | 9,692
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 9,734 | 9,692
Mutual Funds Global Equity [Member] |  |  |
Fair value |  | 890 | 841
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 890 | 841
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value |  | 12,723 | 12,126
Total investments in trading securities: |  | 12,774 | 12,188
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Corporate debt securities, fair value |  | 51 | 62
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 |  | 12,774 | 12,188
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 |  | 60 | 27
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 847 | 426
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 992 | 997
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 34 | 32
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 166 | 111
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 9,734 | 9,692
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Fair value |  | 890 | 841
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 |  | 842 | 1,576
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Total investments carried at fair value |  | 842 | 1,576
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | [2] | 1,828 | 189
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] | 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, 2025. 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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