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Note 13 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale debt securities | $ 275,332 | $ 300,349 | [1]
Derivative assets | 229 | 199 |
Fair Value, Recurring [Member] |  |  |
Available-for-sale debt securities | 275,332 | 300,349 |
Equity securities | 55 | 55 |
Fair value loans | 3,415 | 3,784 |
Derivative assets | 229 | 199 |
Deferred compensation assets | 6,003 | 5,142 |
Deferred compensation liabilities | 7,527 | 5,142 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities | 0 | 0 |
Equity securities | 0 | 0 |
Fair value loans | 0 | 0 |
Derivative assets | 0 | 0 |
Deferred compensation assets | 6,003 | 5,142 |
Deferred compensation liabilities | 7,527 | 5,142 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 275,332 | 300,349 |
Equity securities | 55 | 55 |
Fair value loans | 0 | 0 |
Derivative assets | 229 | 199 |
Deferred compensation assets | 0 | 0 |
Deferred compensation liabilities | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities | 0 | 0 |
Equity securities | 0 | 0 |
Fair value loans | 3,415 | 3,784 |
Derivative assets | 0 | 0 |
Deferred compensation assets | 0 | 0 |
Deferred compensation liabilities | 0 | 0 |
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available-for-sale debt securities | 5,741 | 1,485 |
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities | 0 | 0 |
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 5,741 | 1,485 |
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities | 0 | 0 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale debt securities | 144,920 | 157,264 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities | 0 | 0 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 144,920 | 157,264 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities | 0 | 0 |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale debt securities | 19,401 | 23,309 |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities | 0 | 0 |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 19,401 | 23,309 |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities | 0 | 0 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale debt securities | 26,249 | 34,857 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities |  | 0 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 26,249 | 34,857 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities |  | 0 |
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] |  |  |
Available-for-sale debt securities | 79,021 | 83,434 |
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Available-for-sale debt securities | 0 | 0 |
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Available-for-sale debt securities | 79,021 | 83,434 |
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Available-for-sale debt securities | $ 0 | $ 0 |
[1] | Derived from audited financial statements

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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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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