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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Past Due Total |  | $ 6,490 | [1] | $ 6,358 |
Loans Not Past Due |  | 1,063,178 |  | 795,690 |
Total Loans |  | 1,069,668 |  | 802,048 | $ 409,073
Loan 90 days and accruing |  | 0 |  | 0 |
Agricultural [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 68 |
Loans Not Past Due |  | 53,735 |  | 57,271 |
Total Loans |  | 53,735 |  | 57,339 | 49,109
Loan 90 days and accruing |  | 0 |  | 0 |
Commercial and Industrial [Member] |  |  |  |  |
Past Due Total | [1] | 624 |  | 816 |
Loans Not Past Due |  | 302,903 |  | 147,267 |
Total Loans |  | 303,527 |  | 148,083 | 91,406
Loan 90 days and accruing |  | 0 |  | 0 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 39 |  | 151 |
Loans Not Past Due |  | 33,975 |  | 38,703 |
Total Loans |  | 34,014 |  | 38,854 | 24,382
Loan 90 days and accruing |  | 0 |  | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 2,320 |  | 1,882 |
Loans Not Past Due |  | 466,927 |  | 324,497 |
Total Loans |  | 469,247 |  | 326,379 | 139,453
Loan 90 days and accruing |  | 0 |  | 0 |
Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 1,336 |  | 0 |
Loans Not Past Due |  | 15,303 |  | 13,411 |
Total Loans |  | 16,639 |  | 13,411 | 8,843
Loan 90 days and accruing |  | 0 |  | 0 |
Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 2,171 |  | 3,441 |
Loans Not Past Due |  | 190,335 |  | 214,541 |
Total Loans |  | 192,506 |  | 217,982 | $ 95,880
Loan 90 days and accruing |  | 0 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Past Due Total |  | 3,210 | [1] | 3,129 |
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] | 0 |  | 542 |
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 39 |  | 121 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 532 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 1,076 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 1,563 |  | 2,466 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Past Due Total |  | 589 | [1] | 684 |
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 68 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Past Due Total | [1] | 109 |  | 15 |
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 19 |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 44 |  | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 180 |  | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 256 |  | 582 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Past Due Total |  | 2,691 | [1] | 2,545 |
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] | 515 |  | 259 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 11 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 1,744 |  | 1,882 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 80 |  | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | $ 352 |  | $ 393 |
[1] | Includes nonaccrual loans.

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