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Note 4 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Jun. 30, 2021
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Investments in equity securities |  | $ 14,300 |  | $ 18,258
Investments in debt securities | [1] | 10,625 | [2] | 17,049
Fair Value, Recurring [Member] |  |  |  |
Investments in equity securities |  | 14,300 |  | 18,258
Investments in debt securities |  | 10,625 |  | 17,049
Total investments carried at fair value |  | 24,925 |  | 35,307
Fair Value, Nonrecurring [Member] |  |  |  |
Total investments carried at fair value | [3] | 781 |  | 2,554
Equity Securities International [Member] |  |  |  |
Investments in equity securities |  | 1,539 |  | 10,998
Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |  |
Investments in equity securities |  | 1,539 |  | 10,998
Mutual Funds Fixed Income [Member] |  |  |  |
Investments in equity securities |  | 12,138 |  | 6,322
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |  |
Investments in equity securities |  | 12,138 |  | 6,322
Mutual Funds Global Equity [Member] |  |  |  |
Investments in equity securities |  | 623 |  | 938
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |  |
Investments in equity securities |  | 623 |  | 938
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Investments in equity securities |  | 13,785 |  | 10,097
Investments in debt securities |  | 0 |  | 0
Total investments carried at fair value |  | 13,785 |  | 10,097
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] |  |  |  |
Investments in equity securities |  | 1,024 |  | 2,837
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |  |
Investments in equity securities |  | 12,138 |  | 6,322
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |  |
Investments in equity securities |  | 623 |  | 938
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Investments in equity securities |  | 0 |  | 135
Investments in debt securities |  | 0 |  | 0
Total investments carried at fair value |  | 0 |  | 135
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] |  |  |  |
Investments in equity securities |  | 0 |  | 135
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 |  | 515 |  | 8,026
Investments in debt securities |  | 10,625 |  | 17,049
Total investments carried at fair value |  | 11,140 |  | 25,075
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Total investments carried at fair value | [3] | 781 |  | 2,554
Fair Value, Inputs, Level 3 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |  |
Investments in equity securities |  | 515 |  | 8,026
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] | 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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