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Note 2 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available for sale, less than 12 months, fair value | $ 2,688 | $ 12,998
Securities available for sale, less than 12 months, unrealized losses | (13) | (98)
Securities available for sale, 12 months or longer, fair value | 96,320 | 102,781
Securities available for sale, 12 months or longer, unrealized losses | (11,119) | (14,752)
Securities available for sale, total fair value | 99,008 | 115,779
Securities available for sale, total unrealized losses | (11,132) | (14,850)
US Treasury Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 0 | 4,984
Securities available for sale, less than 12 months, unrealized losses | 0 | (1)
Securities available for sale, 12 months or longer, fair value | 0 | 0
Securities available for sale, 12 months or longer, unrealized losses | 0 | 0
Securities available for sale, total fair value | 0 | 4,984
Securities available for sale, total unrealized losses | 0 | (1)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 694 | 3,914
Securities available for sale, less than 12 months, unrealized losses | (1) | (16)
Securities available for sale, 12 months or longer, fair value | 4,748 | 6,638
Securities available for sale, 12 months or longer, unrealized losses | (24) | (98)
Securities available for sale, total fair value | 5,442 | 10,552
Securities available for sale, total unrealized losses | (25) | (114)
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 | 24,423 | 27,542
Securities available for sale, 12 months or longer, unrealized losses | (454) | (1,056)
Securities available for sale, total fair value | 24,423 | 27,542
Securities available for sale, total unrealized losses | (454) | (1,056)
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 1,994 | 4,100
Securities available for sale, less than 12 months, unrealized losses | (12) | (81)
Securities available for sale, 12 months or longer, fair value | 67,149 | 68,601
Securities available for sale, 12 months or longer, unrealized losses | (10,641) | (13,598)
Securities available for sale, total fair value | 69,143 | 72,701
Securities available for sale, total unrealized losses | $ (10,653) | $ (13,679)

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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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