Note 11 - Fair Value Measurement - Level 3 of Valuation Hierarchy Measured at Fair Value (Details) - Debt Security, Corporate, US [Member] - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
|
| Fair value, beginning of period | $ 10,301 | $ 6,647 | $ 0 | $ 6,596 |
| Transfers into Level 3 | 0 | 0 | 6,000 | 0 |
| Total realized gains included in income | 0 | 0 | 0 | 0 |
| Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end | 193 | (52) | 494 | (1) |
| Purchases | 8,500 | 0 | 12,500 | 0 |
| Transfers out of Level 3 | (4,000) | 0 | (4,000) | 0 |
| Fair value, end of period | $ 14,994 | $ 6,595 | $ 14,994 | $ 6,595 |
| X | ||||||||||
- Definition Amount of gain (loss) recognized in income 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 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://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. 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://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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