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Note 3 - Loans and Allowance for Loan Losses - Nonaccrual Loan by Loan Category (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Nonaccrual loans | $ 5,173 | $ 6,707
Agricultural [Member] |  |
Nonaccrual loans | 348 | 348
Commercial and Industrial [Member] |  |
Nonaccrual loans | 1,699 | 1,802
Consumer Portfolio Segment [Member] |  |
Nonaccrual loans | 0 | 8
Commercial Real Estate Portfolio Segment [Member] |  |
Nonaccrual loans | 1,850 | 3,088
Construction Real Estate [Member] |  |
Nonaccrual loans | 0 | 80
Residential Portfolio Segment [Member] |  |
Nonaccrual loans | $ 1,276 | $ 1,381

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