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Note 3 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities available for sale, less than 12 months, fair value | $ 21,307 | $ 25,329
Securities available for sale, less than 12 months, unrealized losses | (135) | (45)
Securities available for sale, 12 months or longer, fair value | 106,293 | 239,992
Securities available for sale, 12 months or longer, unrealized losses | (15,803) | (14,068)
Securities available for sale, total fair value | 127,600 | 265,321
Securities available for sale, total unrealized losses | (15,938) | (14,113)
US Treasury Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 10,771 | 11,417
Securities available for sale, less than 12 months, unrealized losses | (13) | (14)
Securities available for sale, 12 months or longer, fair value | 0 | 129,108
Securities available for sale, 12 months or longer, unrealized losses | 0 | (829)
Securities available for sale, total fair value | 10,771 | 140,525
Securities available for sale, total unrealized losses | (13) | (843)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value |  | 5,749
Securities available for sale, less than 12 months, unrealized losses |  | (1)
Securities available for sale, 12 months or longer, fair value |  | 0
Securities available for sale, 12 months or longer, unrealized losses |  | 0
Securities available for sale, total fair value |  | 5,749
Securities available for sale, total unrealized losses |  | (1)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 6,204 | 4,742
Securities available for sale, less than 12 months, unrealized losses | (39) | (20)
Securities available for sale, 12 months or longer, fair value | 7,401 | 5,484
Securities available for sale, 12 months or longer, unrealized losses | (224) | (142)
Securities available for sale, total fair value | 13,605 | 10,226
Securities available for sale, total unrealized losses | (263) | (162)
Corporate Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 0 | 0
Securities available for sale, less than 12 months, unrealized losses | 0 | 0
Securities available for sale, 12 months or longer, fair value | 26,982 | 27,081
Securities available for sale, 12 months or longer, unrealized losses | (1,601) | (1,485)
Securities available for sale, total fair value | 26,982 | 27,081
Securities available for sale, total unrealized losses | (1,601) | (1,485)
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 4,332 | 3,421
Securities available for sale, less than 12 months, unrealized losses | (83) | (10)
Securities available for sale, 12 months or longer, fair value | 71,910 | 78,319
Securities available for sale, 12 months or longer, unrealized losses | (13,978) | (11,612)
Securities available for sale, total fair value | 76,242 | 81,740
Securities available for sale, total unrealized losses | $ (14,061) | $ (11,622)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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