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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans by Loan Category (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Recorded Investment with no related allowance recorded | $ 4,607 |  | $ 3,958
Unpaid Principal Balance with no related allowance recorded | 5,613 |  | 4,969
Recorded Investment with an allowance recorded | 5,782 |  | 3,893
Unpaid Principal Balance with an allowance recorded | 5,869 |  | 3,986
Related Allowance | 338 |  | 431
Recorded Investment | 10,389 |  | 7,851
Unpaid Principal Balance | 11,482 |  | 8,955
Average Recorded Investment with no related allowance recorded | 4,282 | $ 2,472 |
Interest Income Recognized with no related allowance recorded | 4 | 0 |
Average Recorded Investment with an allowance recorded | 4,838 | 3,176 |
Interest Income Recognized with an allowance recorded | 21 | 37 |
Average Recorded Investment | 9,120 | 5,648 |
Interest Income Recognized | 25 | 37 |
Agricultural [Member] |  |  |
Recorded Investment with no related allowance recorded | 348 |  | 348
Unpaid Principal Balance with no related allowance recorded | 434 |  | 434
Recorded Investment with an allowance recorded | 2,825 |  | 0
Unpaid Principal Balance with an allowance recorded | 2,825 |  | 0
Related Allowance | 114 |  | 0
Recorded Investment | 3,173 |  | 348
Unpaid Principal Balance | 3,259 |  | 434
Average Recorded Investment with no related allowance recorded | 348 | 272 |
Interest Income Recognized with no related allowance recorded | 0 | 0 |
Average Recorded Investment with an allowance recorded | 1,413 | 379 |
Interest Income Recognized with an allowance recorded | 0 | 0 |
Average Recorded Investment | 1,761 | 651 |
Interest Income Recognized | 0 | 0 |
Commercial and Industrial [Member] |  |  |
Recorded Investment with no related allowance recorded | 1,463 |  | 1,516
Unpaid Principal Balance with no related allowance recorded | 1,574 |  | 1,629
Recorded Investment with an allowance recorded | 163 |  | 147
Unpaid Principal Balance with an allowance recorded | 165 |  | 147
Related Allowance | 2 |  | 19
Recorded Investment | 1,626 |  | 1,663
Unpaid Principal Balance | 1,739 |  | 1,776
Average Recorded Investment with no related allowance recorded | 1,490 | 259 |
Interest Income Recognized with no related allowance recorded | 0 | 0 |
Average Recorded Investment with an allowance recorded | 155 | 7 |
Interest Income Recognized with an allowance recorded | 0 | 0 |
Average Recorded Investment | 1,645 | 266 |
Interest Income Recognized | 0 | 0 |
Consumer Portfolio Segment [Member] |  |  |
Recorded Investment with no related allowance recorded | 0 |  | 0
Unpaid Principal Balance with no related allowance recorded | 0 |  | 0
Recorded Investment with an allowance recorded | 0 |  | 8
Unpaid Principal Balance with an allowance recorded | 0 |  | 8
Related Allowance | 0 |  | 1
Recorded Investment | 0 |  | 9
Unpaid Principal Balance | 0 |  | 8
Average Recorded Investment with no related allowance recorded | 0 | 0 |
Interest Income Recognized with no related allowance recorded | 0 | 0 |
Average Recorded Investment with an allowance recorded | 4 | 16 |
Interest Income Recognized with an allowance recorded | 0 | 0 |
Average Recorded Investment | 4 | 17 |
Interest Income Recognized | 0 | 0 |
Construction Real Estate [Member] |  |  |
Recorded Investment with no related allowance recorded | 0 |  | 80
Unpaid Principal Balance with no related allowance recorded | 0 |  | 80
Recorded Investment with an allowance recorded | 0 |  | 0
Unpaid Principal Balance with an allowance recorded | 0 |  | 0
Related Allowance | 0 |  | 0
Recorded Investment | 0 |  | 80
Unpaid Principal Balance | 0 |  | 80
Average Recorded Investment with no related allowance recorded | 40 | 0 |
Interest Income Recognized with no related allowance recorded | 0 | 0 |
Average Recorded Investment with an allowance recorded | 0 | 0 |
Interest Income Recognized with an allowance recorded | 0 | 0 |
Average Recorded Investment | 40 | 0 |
Interest Income Recognized | 0 | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Recorded Investment with no related allowance recorded | 2,624 |  | 1,852
Unpaid Principal Balance with no related allowance recorded | 3,429 |  | 2,664
Recorded Investment with an allowance recorded | 377 |  | 1,180
Unpaid Principal Balance with an allowance recorded | 384 |  | 1,180
Related Allowance | 10 |  | 157
Recorded Investment | 3,001 |  | 3,031
Unpaid Principal Balance | 3,813 |  | 3,844
Average Recorded Investment with no related allowance recorded | 2,238 | 1,882 |
Interest Income Recognized with no related allowance recorded | 3 | 0 |
Average Recorded Investment with an allowance recorded | 778 | 391 |
Interest Income Recognized with an allowance recorded | 4 | 7 |
Average Recorded Investment | 3,016 | 2,272 |
Interest Income Recognized | 7 | 7 |
Residential Portfolio Segment [Member] |  |  |
Recorded Investment with no related allowance recorded | 172 |  | 162
Unpaid Principal Balance with no related allowance recorded | 176 |  | 162
Recorded Investment with an allowance recorded | 2,417 |  | 2,558
Unpaid Principal Balance with an allowance recorded | 2,495 |  | 2,651
Related Allowance | 212 |  | 254
Recorded Investment | 2,589 |  | 2,720
Unpaid Principal Balance | 2,671 |  | $ 2,813
Average Recorded Investment with no related allowance recorded | 166 | 59 |
Interest Income Recognized with no related allowance recorded | 1 | 0 |
Average Recorded Investment with an allowance recorded | 2,488 | 2,383 |
Interest Income Recognized with an allowance recorded | 17 | 30 |
Average Recorded Investment | 2,654 | 2,442 |
Interest Income Recognized | $ 18 | $ 30 |

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