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Note 3 - Investment Securities - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 198 |
Provision for credit loss expense | (18) | $ 15
Balance, ending | 180 | 198
Accounting Standards Update 2016-13 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 183 |
Balance, ending |  | 183
Municipal securities. |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 198 |
Provision for credit loss expense | (18) | 16
Balance, ending | 180 | 198
Municipal securities. | Accounting Standards Update 2016-13 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 182 |
Balance, ending |  | 182
Other securities |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |
Provision for credit loss expense |  | (1)
Other securities | Accounting Standards Update 2016-13 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 1 |
Balance, ending |  | $ 1

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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