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Note 2 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | ---
Investments in equity securities | $ 13,264 |  | $ 14,300
Investments in debt securities | 8,127 | [1] | 10,625
Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 13,264 |  | 14,300
Investments in debt securities | 8,127 |  | 10,625
Total investments carried at fair value | 21,391 |  | 24,925
Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | 1,439 | [2] | 781
Equity Securities International [Member] |  |  |
Investments in equity securities | 643 |  | 1,539
Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 643 |  | 1,539
Mutual Funds Fixed Income [Member] |  |  |
Investments in equity securities | 11,991 |  | 12,138
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 11,991 |  | 12,138
Mutual Funds Global Equity [Member] |  |  |
Investments in equity securities | 630 |  | 623
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 630 |  | 623
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 13,238 |  | 13,785
Investments in debt securities | 0 |  | 0
Total investments carried at fair value | 13,238 |  | 13,785
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 | 617 |  | 1,024
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 11,991 |  | 12,138
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 630 |  | 623
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 | 26 |  | 515
Investments in debt securities | 8,127 |  | 10,625
Total investments carried at fair value | 8,153 |  | 11,140
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Total investments carried at fair value | 1,439 | [2] | 781
Fair Value, Inputs, Level 3 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member] |  |  |
Investments in equity securities | 26 |  | 515
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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