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Note 8 - Loans Receivable and Credit Disclosures - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Financing receivable modifications, number of contracts | 2 |
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 245 |
Financing receivable modifications, post modification outstanding, recorded investment | $ 245 |
Construction Real Estate [Member] |  |
Financing receivable modifications, number of contracts |  |
Financing receivable modifications, pre-modification outstanding, recorded investment |  |
Financing receivable modifications, post modification outstanding, recorded investment |  |
Family Residential Real Estate 1-4 [Member] |  |
Financing receivable modifications, number of contracts |  |
Financing receivable modifications, pre-modification outstanding, recorded investment |  |
Financing receivable modifications, post modification outstanding, recorded investment |  |
Commercial Real Estate Portfolio Segment [Member] |  |
Financing receivable modifications, number of contracts | 1 |
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 184 |
Financing receivable modifications, post modification outstanding, recorded investment | $ 184 |
Agriculture Real Estate [Member] |  |
Financing receivable modifications, number of contracts |  |
Financing receivable modifications, pre-modification outstanding, recorded investment |  |
Financing receivable modifications, post modification outstanding, recorded investment |  |
Commercial Portfolio Segment [Member] |  |
Financing receivable modifications, number of contracts | 1 |
Financing receivable modifications, pre-modification outstanding, recorded investment | $ 61 |
Financing receivable modifications, post modification outstanding, recorded investment | $ 61 |
Agriculture [Member] |  |
Financing receivable modifications, number of contracts |  |
Financing receivable modifications, pre-modification outstanding, recorded investment |  |
Financing receivable modifications, post modification outstanding, recorded investment |  |
Consumer and Other [Member] |  |
Financing receivable modifications, number of contracts |  |
Financing receivable modifications, pre-modification outstanding, recorded investment |  |
Financing receivable modifications, post modification outstanding, recorded investment |  |

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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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- 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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