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Note 5 - Loans Receivable and Credit Disclosures - Troubled Debt Restructurings (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Financing receivable modifications, number of contracts | 6 | 3
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 10,273 | $ 1,035
Financing receivable modifications, post modification outstanding, recorded investment | $ 10,273 | $ 1,035
Construction Real Estate [Member] |  |
Financing receivable modifications, number of contracts | 0 | 0
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 0 | $ 0
Financing receivable modifications, post modification outstanding, recorded investment | $ 0 | $ 0
Family Residential Real Estate 1-4 [Member] |  |
Financing receivable modifications, number of contracts | 0 | 3
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 0 | $ 1,035
Financing receivable modifications, post modification outstanding, recorded investment | $ 0 | $ 1,035
Commercial Real Estate Portfolio Segment [Member] |  |
Financing receivable modifications, number of contracts | 2 | 0
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 10,192 | $ 0
Financing receivable modifications, post modification outstanding, recorded investment | $ 10,192 | $ 0
Agriculture Real Estate [Member] |  |
Financing receivable modifications, number of contracts | 0 | 0
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 0 | $ 0
Financing receivable modifications, post modification outstanding, recorded investment | $ 0 | $ 0
Commercial Portfolio Segment [Member] |  |
Financing receivable modifications, number of contracts | 0 | 0
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 0 | $ 0
Financing receivable modifications, post modification outstanding, recorded investment | $ 0 | $ 0
Agriculture [Member] |  |
Financing receivable modifications, number of contracts | 3 | 0
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 54 | $ 0
Financing receivable modifications, post modification outstanding, recorded investment | $ 54 | $ 0
Consumer and Other [Member] |  |
Financing receivable modifications, number of contracts | 1 | 0
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 27 | $ 0
Financing receivable modifications, post modification outstanding, recorded investment | $ 27 | $ 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=121611835&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=121611835&loc=SL6953676-111524 + Details
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