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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Past Due Total |  | $ 5,982 | [1] | $ 6,358 |
Loans Not Past Due |  | 902,011 |  | 795,690 |
Total Loans |  | 907,993 |  | 802,048 | $ 397,227
Loan 90 days and accruing |  | 0 |  | 0 |
Agricultural [Member] |  |  |  |  |
Past Due Total | [1] | 379 |  | 68 |
Loans Not Past Due |  | 50,556 |  | 57,271 |
Total Loans |  | 50,935 |  | 57,339 | 40,881
Loan 90 days and accruing |  | 0 |  | 0 |
Commercial and Industrial [Member] |  |  |  |  |
Past Due Total | [1] | 783 |  | 816 |
Loans Not Past Due |  | 241,229 |  | 147,267 |
Total Loans |  | 242,012 |  | 148,083 | 85,082
Loan 90 days and accruing |  | 0 |  | 0 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 15 |  | 151 |
Loans Not Past Due |  | 33,754 |  | 38,703 |
Total Loans |  | 33,769 |  | 38,854 | 24,682
Loan 90 days and accruing |  | 0 |  | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 4,066 |  | 1,882 |
Loans Not Past Due |  | 358,997 |  | 324,497 |
Total Loans |  | 363,063 |  | 326,379 | 140,942
Loan 90 days and accruing |  | 0 |  | 0 |
Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Loans Not Past Due |  | 15,576 |  | 13,411 |
Total Loans |  | 15,576 |  | 13,411 | 9,948
Loan 90 days and accruing |  | 0 |  | 0 |
Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 739 |  | 3,441 |
Loans Not Past Due |  | 201,899 |  | 214,541 |
Total Loans |  | 202,638 |  | 217,982 | $ 95,692
Loan 90 days and accruing |  | 0 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Past Due Total |  | 2,309 | [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] | 103 |  | 542 |
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 5 |  | 121 |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 1,955 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 246 |  | 2,466 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Past Due Total |  | 420 | [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] | 0 |  | 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] | 8 |  | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 412 |  | 582 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Past Due Total |  | 3,253 | [1] | 2,545 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural [Member] |  |  |  |  |
Past Due Total | [1] | 379 |  | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |  |
Past Due Total | [1] | 680 |  | 259 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 10 |  | 11 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | 2,103 |  | 1,882 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member] |  |  |  |  |
Past Due Total | [1] | 0 |  | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Past Due Total | [1] | $ 81 |  | $ 393 |
[1] | Includes nonaccrual loans.

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