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Note 1 - Basis of Presentation and Significant Accounting Policies (Details Textual) |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 USD ($) | Jan. 01, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of Operating Segments |  |  |  |  | 1 |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total |  |  |  |  | $ 360,000 |  |
Minimum Principal Balance of Loans for Quarterly Rating Review |  |  |  |  | 500,000 |  |
Restructured Loans, Reserves |  |  |  |  | $ 500,000 |  |
Off-Balance Sheet, Credit Loss, Liability, Ending Balance | [1] |  | $ 66,000 |  |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  |  |  |  | 10 years |  |
Number of Reportable Segments |  |  |  |  | 1 |  |
Goodwill, Impairment Loss |  | $ 0 |  |  | $ 0 | $ 0 | $ 0
Financing Receivable, Allowance for Credit Loss, Ending Balance |  |  | 26,182,000 | [2] | 27,858,000 | 26,182,000 | $ 18,425,000
Deferred Tax Assets, Net of Valuation Allowance, Total |  |  | 17,493,000 | [3] | 18,895,000 | 23,492,000 |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  | 237,585,000 | [4] | 264,824,000 | 237,585,000 |
Other Assets, Total |  |  |  |  | $ 106,691,000 | $ 105,298,000 |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  |  | 23.09% | 22.09% | 22.24%
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, Ending Balance | [1] |  | 509,000 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | [2] |  | 13,107,000 |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Total | [3] |  | 1,813,000 |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | [4] |  | $ (5,870,000) |  |  |  |
SBA CARES Act Paycheck Protection Program [Member] |  |  |  |  |  |  |
Financing Receivable, Deferred Payments, Forgiven Amount |  |  |  |  | $ 56,860,000 |  |
Financing Receivable, Percentage of Loans Forgiven from Total Loans with Deferred Payments |  |  |  |  | 93.20% |  |
SBA CARES Act Paycheck Protection Program, First Round [Member] |  |  |  |  |  |  |
Financing Receivable, Deferred Payments, Forgiven Amount |  |  |  |  | $ 56,740,000 |  |
Financing Receivable, Percentage of Loans Forgiven from Total Loans with Deferred Payments |  |  |  |  | 93.03% |  |
SBA CARES Act Paycheck Protection Program, Second Round [Member] |  |  |  |  |  |  |
Financing Receivable, Deferred Payments, Forgiven Amount |  |  |  |  | $ 8,910,000 |  |
Financing Receivable, Percentage of Loans Forgiven from Total Loans with Deferred Payments |  |  |  |  | 28.22% |  |
Consumer Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  | $ 9,972,000 | $ 8,951,000 | $ 6,325,000
Consumer Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Number Closed Under Paycheck Protection Program Under CARES Act |  |  |  |  | 1,429 |  |
Consumer Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | SBA CARES Act Paycheck Protection Program [Member] |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Total |  |  |  |  | $ 92,580,000 |  |
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 |  |  |  |  | $ 3,850,000 | 3,930,000 |
Other Liabilities [Member] |  |  |  |  |  |  |
Off-Balance Sheet, Credit Loss, Liability, Ending Balance |  |  |  |  | 678,000 |  |
Investment in Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock [Member] | Other Assets [Member] |  |  |  |  |  |  |
Investment Owned, at Cost |  |  |  |  | $ 9,780,000 | $ 10,800,000 |
[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] | 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.
[4] | Net adjustment to retained earnings related to the adoption of ASU 2016-13.

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