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Note 3 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023
--- | --- | ---
Investments in equity securities | $ 11,920 |  | $ 13,205
Investments in debt securities | 6,343 | [1] | 7,008
Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 11,920 |  | 13,205
Investments in debt securities | 6,343 |  | 7,008
Total investments carried at fair value | 18,263 |  | 20,213
Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | 435 | [2] | 1,786
Equity Securities International [Member] |  |  |
Investments in equity securities | 425 |  | 778
Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 425 |  | 778
Mutual Funds Fixed Income [Member] |  |  |
Investments in equity securities | 10,793 |  | 11,642
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 10,793 |  | 11,642
Mutual Funds Global Equity [Member] |  |  |
Investments in equity securities | 702 |  | 785
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 702 |  | 785
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 11,916 |  | 12,915
Investments in debt securities | 0 |  | 0
Total investments carried at fair value | 11,916 |  | 12,915
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | 0 | [2] | 0
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 421 |  | 488
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 10,793 |  | 11,642
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 702 |  | 785
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 0 |  | 0
Investments in debt securities | 0 |  | 0
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
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] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 4 |  | 290
Investments in debt securities | 6,343 |  | 7,008
Total investments carried at fair value | 6,347 |  | 7,298
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | 435 | [2] | 1,786
Fair Value, Inputs, Level 3 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 4 |  | 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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