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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Loans |  | $ 988,357 |  | $ 1,069,668 | $ 1,078,796
Loan 90 days and accruing |  | 0 |  | 0 |
Agricultural [Member] |  |  |  |  |
Loans |  | 63,445 |  | 53,735 | 53,503
Loan 90 days and accruing |  | 0 |  | 0 |
Commercial and Industrial [Member] |  |  |  |  |
Loans |  | 217,242 |  | 303,527 | 306,120
Loan 90 days and accruing |  | 0 |  | 0 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Loans |  | 33,806 |  | 34,014 | 34,153
Loan 90 days and accruing |  | 0 |  | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Loans |  | 485,332 |  | 469,247 | 463,306
Loan 90 days and accruing |  | 0 |  | 0 |
Construction Real Estate [Member] |  |  |  |  |
Loans |  | 18,238 |  | 16,639 | 16,489
Loan 90 days and accruing |  | 0 |  | 0 |
Residential Portfolio Segment [Member] |  |  |  |  |
Loans |  | 170,294 |  | 192,506 | $ 205,225
Loan 90 days and accruing |  | 0 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Loans |  | 194 | [1] | 3,210 |
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural [Member] |  |  |  |  |
Loans | [1] | 0 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Loans | [1] | 83 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 5 |  | 39 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 94 |  | 532 |
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Loans | [1] | 0 |  | 1,076 |
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 12 |  | 1,563 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Loans |  | 581 | [1] | 589 |
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural [Member] |  |  |  |  |
Loans | [1] | 0 |  | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Loans | [1] | 305 |  | 109 |
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 0 |  | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 0 |  | 44 |
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Loans | [1] | 0 |  | 180 |
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 276 |  | 256 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Loans |  | 721 | [1] | 2,691 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural [Member] |  |  |  |  |
Loans | [1] | 0 |  | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Loans | [1] | 296 |  | 515 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 0 |  | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 243 |  | 1,744 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Loans | [1] | 0 |  | 80 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 182 |  | 352 |
Financial Asset, Past Due [Member] |  |  |  |  |
Loans |  | 1,496 | [1] | 6,490 |
Financial Asset, Past Due [Member] | Agricultural [Member] |  |  |  |  |
Loans | [1] | 0 |  | 0 |
Financial Asset, Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Loans | [1] | 684 |  | 624 |
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 5 |  | 39 |
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 337 |  | 2,320 |
Financial Asset, Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Loans | [1] | 0 |  | 1,336 |
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Loans | [1] | 470 |  | 2,171 |
Financial Asset, Not Past Due [Member] |  |  |  |  |
Loans |  | 986,861 |  | 1,063,178 |
Financial Asset, Not Past Due [Member] | Agricultural [Member] |  |  |  |  |
Loans |  | 63,445 |  | 53,735 |
Financial Asset, Not Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Loans |  | 216,558 |  | 302,903 |
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Loans |  | 33,801 |  | 33,975 |
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Loans |  | 484,995 |  | 466,927 |
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Loans |  | 18,238 |  | 15,303 |
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Loans |  | $ 169,824 |  | $ 190,335 |
[1] | Includes nonaccrual loans.

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