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Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Investment securities available for sale, Estimated fair value | $ 476,595,000 | $ 437,735,000
Fair Value, Recurring [Member] |  |
Investment securities available for sale, Estimated fair value | 476,595,000 | 437,735,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available for sale, Estimated fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available for sale, Estimated fair value | 476,595,000 | 437,735,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities available for sale, Estimated fair value | 0 | 0
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] |  |
Investment securities available for sale, Estimated fair value | 253,165,000 | 228,391,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] |  |
Investment securities available for sale, Estimated fair value | 253,165,000 | 228,391,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available for sale, Estimated fair value | 0 | 0
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available for sale, Estimated fair value | 253,165,000 | 228,391,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities available for sale, Estimated fair value | 0 | 0
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] |  |
Investment securities available for sale, Estimated fair value | 134,764,000 | 121,870,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] | Fair Value, Recurring [Member] |  |
Investment securities available for sale, Estimated fair value | 134,764,000 | 121,870,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available for sale, Estimated fair value | 0 | 0
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available for sale, Estimated fair value | 134,764,000 | 121,870,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities available for sale, Estimated fair value | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale, Estimated fair value | 88,666,000 | 87,474,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Investment securities available for sale, Estimated fair value | 88,666,000 | 87,474,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available for sale, Estimated fair value | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available for sale, Estimated fair value | 88,666,000 | 87,474,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities available for sale, Estimated fair value | $ 0 | $ 0

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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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