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Note 5 - Loans and Related Allowance for Loan and Lease Losses - Troubled Debt Restructurings (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Number of contracts |  |
Pre-modification outstanding recorded investment | $ 826 | $ 139
Post-modification outstanding recorded investment | $ 826 | $ 138
Commercial And Industrial [Member] |  |
Number of contracts |  | 2
Pre-modification outstanding recorded investment |  | $ 25
Post-modification outstanding recorded investment |  | $ 24
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |
Number of contracts | 1 |
Pre-modification outstanding recorded investment | $ 730 |
Post-modification outstanding recorded investment | $ 730 |
Residential Portfolio Segment [Member] |  |
Number of contracts | 1 | 1
Pre-modification outstanding recorded investment | $ 96 | $ 114
Post-modification outstanding recorded investment | $ 96 | $ 114
Extended Maturity [Member] |  |
Number of contracts |  |
Extended Maturity [Member] | Commercial And Industrial [Member] |  |
Number of contracts |  | 2
Extended Maturity [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |
Number of contracts | 1 |
Extended Maturity [Member] | Residential Portfolio Segment [Member] |  |
Number of contracts | 1 | 1
Other Restructurings [Member] |  |
Number of contracts |  |
Other Restructurings [Member] | Commercial And Industrial [Member] |  |
Number of contracts |  | 0
Other Restructurings [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |
Number of contracts | 0 |
Other Restructurings [Member] | Residential Portfolio Segment [Member] |  |
Number of contracts | 0 | 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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