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Note 3 - Investment Securities - Activity in Allowance for Credit Losses HTM and AFS securities by major security (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 180 | $ 180 |
Provision for credit loss expense |  | 23 |
Balance, ending |  | 203 | $ 180
Balance, ending |  | 989 |
Municipal securities. |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 180 | 180 | 198
Provision for credit loss expense |  | 22 | (18)
Balance, ending |  | 202 | $ 180
Corporate securities |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |
Provision for credit loss expense | $ 989 | 989 |
Balance, ending |  | 989 |
Other securities |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |
Provision for credit loss expense |  | 1 |
Balance, ending |  | 1 |
Balance, ending |  | $ 989 |

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- Definition Amount excluding accrued interest, of allowance for credit loss on 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 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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Period Type: | instant

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- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at amortized cost (held-to-maturity) from change in methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-11 + Details
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