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Note 3 - Loans and Allowance for Loan Losses - Credit Risk Profile (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Loans | $ 988,357 | $ 1,069,668 | $ 1,078,796
Nonaccrual | 1,731 | 6,707 |
Agricultural [Member] |  |  |
Loans | 63,445 | 53,735 | 53,503
Nonaccrual | 342 | 348 |
Agricultural [Member] | Pass [Member] |  |  |
Loans | 60,042 | 50,185 |
Agricultural [Member] | Special Mention [Member] |  |  |
Loans | 352 | 3,202 |
Agricultural [Member] | Substandard [Member] |  |  |
Loans | 3,051 | 348 |
Agricultural [Member] | Doubtful [Member] |  |  |
Loans | 0 | 0 |
Consumer Portfolio Segment [Member] |  |  |
Loans | 33,806 | 34,014 | 34,153
Nonaccrual | 0 | 8 |
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |
Loans | 33,806 | 34,006 |
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |
Loans | 0 | 0 |
Commercial and Industrial [Member] |  |  |
Loans | 217,242 | 303,527 | 306,120
Nonaccrual | 296 | 1,802 |
Commercial and Industrial [Member] | Pass [Member] |  |  |
Loans | 214,493 | 294,614 |
Commercial and Industrial [Member] | Special Mention [Member] |  |  |
Loans | 1,133 | 4,101 |
Commercial and Industrial [Member] | Substandard [Member] |  |  |
Loans | 1,320 | 4,812 |
Commercial and Industrial [Member] | Doubtful [Member] |  |  |
Loans | 296 | 0 |
Construction Real Estate [Member] |  |  |
Loans | 18,238 | 16,639 | 16,489
Nonaccrual | 0 | 80 |
Construction Real Estate [Member] | Performing Financial Instruments [Member] |  |  |
Loans | 18,238 | 16,559 |
Construction Real Estate [Member] | Nonperforming Financial Instruments [Member] |  |  |
Loans | 0 | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Loans | 485,332 | 469,247 | 463,306
Nonaccrual | 242 | 3,088 |
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |
Loans | 477,227 | 453,080 |
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans | 2,105 | 6,006 |
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans | 5,758 | 8,925 |
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |  |
Loans | 242 | 1,236 |
Residential Portfolio Segment [Member] |  |  |
Loans | 170,294 | 192,506 | $ 205,225
Nonaccrual | 851 | 1,381 |
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |
Loans | 169,443 | 191,125 |
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |
Loans | $ 0 | $ 0 |

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