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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($) | Mar. 31, 2020
Number of loans | 7 | 0
Pre-modification | $ 3,284 |
Post-modification | $ 3,284 |
Commercial Real Estate Portfolio Segment [Member] |  |
Number of loans | 1 |
Pre-modification | $ 958 |
Post-modification | $ 958 |
Agricultural [Member] |  |
Number of loans | 6 |
Pre-modification | $ 2,326 |
Post-modification | $ 2,326 |
Financial Asset, 30 Days Past Due or More [Member] |  |
Number of loans | 4 |
Recorded investment | $ 1,902 |
Financial Asset, 30 Days Past Due or More [Member] | Commercial and Industrial [Member] |  |
Number of loans | 1 |
Recorded investment | $ 52 |
Financial Asset, 30 Days Past Due or More [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Number of loans | 3 |
Recorded investment | $ 1,850 |

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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=121611835&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=121611835&loc=SL6953676-111524 + Details
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