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Note 1 - Basis of Presentation and Significant Accounting Policies (Details Textual) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Number of Operating Segments |  |  |  | 1 |  |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss |  |  |  | $ 1,250,000 | $ 1,340,000 |  |
Minimum Principal Balance of Loans for Quarterly Rating Review |  |  |  | 500,000 |  |  |
Off-Balance-Sheet, Credit Loss, Liability |  | $ 66,000 | [1] | $ 746,000 | 1,196,000 |  | $ 678,000
Lessee, Operating Lease, Term of Contract (Year) |  |  |  | 10 years |  |  |
Number of Reportable Segments |  |  |  | 1 |  |  |
Goodwill, Impairment Loss |  |  |  | $ 0 |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  | 26,182,000 | [2] | 36,189,000 | 30,556,000 | [3] | $ 27,858,000
Deferred Tax Assets, Net of Valuation Allowance, Total |  | 17,493,000 | [4] | 25,304,000 | 21,874,000 |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  | 237,585,000 | [5] | 319,902,000 | 292,971,000 | [3] |
Other Assets, Total |  |  |  | $ 114,211,000 | $ 103,673,000 | [3] |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  | 22.51% | 22.43% |  | 23.09%
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  | $ 5,880,000 |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  | 23.37% |  |  |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Other Assets, Total |  | $ 57,000 |  |  |  |  |
Accounting Standards Update 2016-13 [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  | 57,000 |  |  |  |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Off-Balance-Sheet, Credit Loss, Liability | [1] | 509,000 |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | [2] | 13,107,000 |  |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Total | [4] | 1,813,000 |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | [5] | $ (5,870,000) |  |  |  |  |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 5 years |  |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 10 years |  |  |
Equipment, Computer Hardware and Software [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 3 years |  |  |
Equipment, Computer Hardware and Software [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 5 years |  |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 7 years |  |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 40 years |  |  |
Land and Land Improvements [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 20 years |  |  |
Other Assets [Member] |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  |  | $ 3,700,000 | $ 3,780,000 |  |
Other Liabilities [Member] |  |  |  |  |  |  |
Off-Balance-Sheet, Credit Loss, Liability |  |  |  | 746,000 | 1,200,000 |  |
Investment in Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock [Member] | Other Assets [Member] |  |  |  |  |  |  |
Investment Owned, Cost |  |  |  | $ 13,040,000.00 | $ 10,020,000.00 |  |
[1] | Adjustment to the reserve for unfunded commitments related to the adoption of ASU 2016-13.
[2] | Calculated adjustment to the ACL related to the adoption of ASU 2016-13. Includes additional reserve related to purchased deteriorated loans of $5.88 million.
[3] | Derived from audited financial statements
[4] | Effect of deferred tax assets related to the adjustment to the ACL form the adoption of ASU 2016-13 using a 23.37% tax rate.
[5] | Net adjustment to retained earnings related to the adoption of ASU 2016-13.

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