Note 8 - Fair Value Disclosures and Reporting and Fair Value Measurements - Level 3 Reconciliation (Details) - Corporate Debt Securities [Member] - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Balance of recurring Level 3 assets at January 1, | $ 1,313 | $ 55,653 |
| Included in other comprehensive income | 110 | 132 |
| Purchases | 0 | 0 |
| Transfers out of Level 3 | 0 | (54,553) |
| Balance of recurring Level 3 assets at September 30, | $ 1,423 | $ 1,232 |
| X | ||||||||||
- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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