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Note 2 - Investments - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Net gains (losses) recognized during the period |  | $ 1,913 | $ 33
Less: Net gains (losses) recognized during the period on securities sold during the period |  | 0 | 0
Net unrealized gains (losses) recognized during the reporting period on securities still held at the reporting date (1) | [1] | 1,913 | 33
Net gains (losses) recognized during the period |  | (11) | 40
Less: Net gains (losses) recognized during the period on securities sold during the period |  | 0 | 0
Corporate debt securities, Unrealized gains (losses) |  | $ (11) | $ 40
[1] | Includes net unrealized gains of $1.3 million as a result of the measurement alternative for the three months ended September 30, 2025. There were no amounts included as a result of the measurement alternative for the three months ended September 30, 2024.

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- Definition Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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