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Note 3 - Investment Securities - Schedule of Available for Sale Debt Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Residential mortgage-backed securities, debt securities, available for sale, continuous unrealized loss position, less than twelve months, fair value | $ 5 | $ 46
Residential mortgage-backed securities, debt securities, available for sale, unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Residential mortgage-backed securities, debt securities, available for sale, unrealized loss position, twelve months or greater, fair value | 3,519 | 3,816
Residential mortgage-backed securities, debt securities, available for sale, unrealized loss position, twelve months or greater, unrealized losses | 286 | 279
Residential mortgage-backed securities, debt securities, available for sale, fair value, total | 3,524 | 3,862
Residential mortgage-backed securities, debt securities, available for sale, unrealized loss position, unrealized losses, total | 286 | 279
Residential Mortgage-Backed Securities [Member] |  |
Residential mortgage-backed securities, debt securities, available for sale, continuous unrealized loss position, less than twelve months, fair value | 5 | 46
Residential mortgage-backed securities, debt securities, available for sale, unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Residential mortgage-backed securities, debt securities, available for sale, unrealized loss position, twelve months or greater, fair value | 3,519 | 3,816
Residential mortgage-backed securities, debt securities, available for sale, unrealized loss position, twelve months or greater, unrealized losses | 286 | 279
Residential mortgage-backed securities, debt securities, available for sale, fair value, total | 3,524 | 3,862
Residential mortgage-backed securities, debt securities, available for sale, unrealized loss position, unrealized losses, total | $ 286 | $ 279

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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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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: 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 2: 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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