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Note 3 - Investments - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Net gains and losses recognized during the period on equity securities |  | $ (1,261) | $ (1,930)
Less: Net gains and losses recognized during the period on equity securities sold during the period |  | (43) | 0
Unrealized gains and losses recognized during the reporting period on equity securities still held at the reporting date (1) | [1] | $ (1,218) | $ (1,930)
[1] | Includes $1.8 million of net losses for the nine months ended March 31, 2023, as a result of the measurement alternative. There were no net gains (losses) as a result of the measurement alternative for the three months ended March 31, 2023, or for the three and nine months ended March 31, 2022.

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- Definition Amount of unrealized and realized gain (loss) on investment in debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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- Definition Amount of unrealized and realized gain (loss) on investment in debt and equity securities, excluding other-than-temporary impairment (OTTI). + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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