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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Past Due Total |  | $ 4,769 | [1] | $ 6,490 |
Loans Not Past Due |  | 1,030,314 |  | 1,063,178 |
Total Loans |  | 1,035,083 |  | 1,069,668 | $ 811,577
Loan 90 days and accruing |  | 0 |  | 0 |
Agricultural [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Loans Not Past Due |  | 46,686 |  | 53,735 |
Total Loans |  | 46,686 |  | 53,735 | 50,483
Loan 90 days and accruing |  | 0 |  | 0 |
Commercial and Industrial [Member] |  |  |  |  |
Past Due Total | [1] | 595 |  | 624 |
Loans Not Past Due |  | 297,455 |  | 302,903 |
Total Loans |  | 298,050 |  | 303,527 | 141,201
Loan 90 days and accruing |  | 0 |  | 0 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 11 |  | 39 |
Loans Not Past Due |  | 32,319 |  | 33,975 |
Total Loans |  | 32,330 |  | 34,014 | 34,252
Loan 90 days and accruing |  | 0 |  | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 1,850 |  | 2,320 |
Loans Not Past Due |  | 460,571 |  | 466,927 |
Total Loans |  | 462,421 |  | 469,247 | 351,753
Loan 90 days and accruing |  | 0 |  | 0 |
Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 492 |  | 1,336 |
Loans Not Past Due |  | 15,178 |  | 15,303 |
Total Loans |  | 15,670 |  | 16,639 | 17,525
Loan 90 days and accruing |  | 0 |  | 0 |
Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 1,821 |  | 2,171 |
Loans Not Past Due |  | 178,105 |  | 190,335 |
Total Loans |  | 179,926 |  | 192,506 | $ 216,363
Loan 90 days and accruing |  | 0 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Past Due Total |  | 2,611 | [1] | 3,210 |
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Past Due Total | [1] | 182 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 11 |  | 39 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 184 |  | 532 |
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 492 |  | 1,076 |
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 1,742 |  | 1,563 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Past Due Total |  | 0 | [1] | 589 |
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 109 |
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 44 |
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 180 |
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 256 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Past Due Total |  | 2,158 | [1] | 2,691 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Past Due Total | [1] | 413 |  | 515 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 1,666 |  | 1,744 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 80 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | $ 79 |  | $ 352 |
[1] | Includes nonaccrual loans.

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