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Note 3 - Debt Securities (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 112 | 113 |
Percentage of Combined Depreciation of Combined Reported Value of Aggregate Securities Portfolio | 5.02% | 6.59% |
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 38,979 | $ 0 | $ 370
Debt Securities, Available-for-Sale, Realized Gain | 30 |  |
Debt Securities, Available-for-Sale, Realized Loss | 51 |  |
Debt Securities, Available-for-Sale, Amortized Cost | 295,045 | 320,123 |
US Government Agencies Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 5,750 | 1,500 |
US Treasury Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 146,653 | 161,617 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 19,528 | 23,480 |
Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 28,566 | 37,046 |
Mortgage-backed Agency Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 94,548 | 96,480 |
Asset Pledged as Collateral [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 145,090 | $ 22,430 |

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- Definition Amortized cost 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 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 3: 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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