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Note 4 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Jun. 30, 2022
--- | --- | ---
Fair value |  | $ 13,205 |  | $ 14,300
Investments in debt securities | [1] | 7,008 | [2] | 10,625
Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 13,205 |  | 14,300
Investments in debt securities |  | 7,008 |  | 10,625
Total investments carried at fair value |  | 20,213 |  | 24,925
Fair Value, Nonrecurring [Member] |  |  |  |
Total investments carried at fair value | [3] | 1,786 |  | 781
Equity Securities International [Member] |  |  |  |
Fair value |  | 778 |  | 1,539
Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 778 |  | 1,539
Mutual Funds Fixed Income [Member] |  |  |  |
Fair value |  | 11,642 |  | 12,138
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 11,642 |  | 12,138
Mutual Funds Global Equity [Member] |  |  |  |
Fair value |  | 785 |  | 623
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 785 |  | 623
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 12,915 |  | 13,785
Investments in debt securities |  | 0 |  | 0
Total investments carried at fair value |  | 12,915 |  | 13,785
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Total investments carried at fair value | [3] | 0 |  | 0
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 488 |  | 1,024
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 11,642 |  | 12,138
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 785 |  | 623
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 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 | [3] | 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] | 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, Recurring [Member] |  |  |  |
Fair value |  | 290 |  | 515
Investments in debt securities |  | 7,008 |  | 10,625
Total investments carried at fair value |  | 7,298 |  | 11,140
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Total investments carried at fair value | [3] | 1,786 |  | 781
Fair Value, Inputs, Level 3 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair value |  | 290 |  | 515
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] | Changes in unrealized gains and losses are included in the statement of comprehensive income (loss), except for embedded derivatives. Changes in unrealized and realized gains and losses for embedded derivatives are included in earnings in the statement of operations.
[2] | Principal payments of $750,000 are due quarterly with a final maturity in January 2026.
[3] | Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative on dates other than June 30, 2022, or June 30, 2021, respectively. 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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