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Note 1 - Summary of Significant Accounting Policies (Details Textual) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 07, 2022 USD ($) | Dec. 31, 2019 USD ($)
Number of Operating Segments |  |  | 2 |  |  |  |
Gain (Loss) on Disposition of Business |  |  | $ (870,000) | $ (0) | $ (0) |  |
Mortgage Servicing Rights, Amortization Period (Year) |  |  | 7 years |  |  |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total |  |  | $ 3,800,000 | 2,600,000 |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance |  |  | 0 | 0 |  |  |
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss |  |  | 1,800,000 | 0 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Ending Balance |  |  | 0 | 0 |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  | 439,898,000 | 391,201,000 |  |  |
Loans and Leases Receivable, Allowance, Impact of Accounting Policy Adoption |  |  |  |  | $ 8,221,000 |  |
Off-Balance Sheet, Credit Loss, Liability, Ending Balance |  | $ 3,850,000 |  |  |  |  | $ 350,000
Cash Reserve Deposit Required and Made |  |  | $ 200,000 | $ 200,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 3 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 40 years |  |  |  |
Transfer of Loans From Purchased Credit Impaired to Purchased Credit Deteriorated [Member] |  |  |  |  |  |  |
Loans and Leases Receivable, Net Amount, Total |  | 1,600,000 |  |  |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  | 8,800,000 |  |  |  |  |
Loans and Leases Receivable, Allowance, Impact of Accounting Policy Adoption |  | 8,200,000 |  |  |  |  |
Off-Balance Sheet, Credit Loss, Liability, Ending Balance | [1] | 3,500,000 |  |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Total |  | $ 2,900,000 |  |  |  |  |
Landmark Financial Advisors, LLC (LFA) [Member] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  | $ (870,000) |  |  |  |
Commonwealth [Member] |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 100.00% |
Off-Balance Sheet, Credit Loss, Liability, Ending Balance |  |  |  |  |  | $ 500,000 |
Landmark Financial Advisors, LLC (LFA) [Member] |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 60.00% |
[1] | The impact of the ASC 326 adoption on the ACL on loans reflects $8.2 million related to the transition from the incurred loss ACL model to the CECL ACL model and $1.6 million related to the transition from PCI to PCD methodology as defined in thestandard.

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