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Note 3 - Loans and Allowance for Loan Losses - Nonaccrual Loan by Loan Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Nonaccrual loans | $ 6,707 | $ 4,687
Agricultural [Member] |  |
Nonaccrual loans | 348 | 379
Commercial and Industrial [Member] |  |
Nonaccrual loans | 1,802 | 776
Consumer Portfolio Segment [Member] |  |
Nonaccrual loans | 8 | 16
Commercial Real Estate Portfolio Segment [Member] |  |
Nonaccrual loans | 3,088 | 2,185
Construction Real Estate [Member] |  |
Nonaccrual loans | 80 | 0
Residential Portfolio Segment [Member] |  |
Nonaccrual loans | $ 1,381 | $ 1,331

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