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Note 3 - Loans and Allowance for Loan Losses - Nonaccrual Loan by Loan Category (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Nonaccrual loans | $ 4,135 | $ 4,687
Agricultural [Member] |  |
Nonaccrual loans | 379 | 379
Commercial and Industrial [Member] |  |
Nonaccrual loans | 758 | 776
Consumer Portfolio Segment [Member] |  |
Nonaccrual loans | 23 | 16
Commercial Real Estate Portfolio Segment [Member] |  |
Nonaccrual loans | 2,146 | 2,185
Construction Real Estate [Member] |  |
Nonaccrual loans | 0 | 0
Residential Portfolio Segment [Member] |  |
Nonaccrual loans | $ 829 | $ 1,331

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