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Note 1 - Basis of Presentation (Details Textual) |  | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of Operating Segments |  |  |  | 1 |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  | $ 237,585,000 | [1] | $ 250,911,000 |  |  | $ 237,585,000 | [2] |  |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total |  |  |  | 350,000 |  |  |  |  |  |  |
Minimum Principal Balance of Loans for Quarterly Rating Review |  |  |  | 500,000 |  |  |  |  |  |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss |  |  |  | 8,100,000 |  |  |  |  |  |  |
Off-Balance Sheet, Credit Loss, Liability, Ending Balance | [3] | 66,000 |  |  |  |  |  |  |  |  |
Financing Receivable, Deferred Payments |  |  |  | 4,020,000.00 |  |  | 32,260,000 |  | $ 436,110,000 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  | 26,182,000 | [4] | 31,857,000 | [5] | $ 34,563,000 | 26,182,000 | [2],[5] | 23,758,000 | $ 21,137,000 | $ 18,425,000
Deferred Tax Assets, Net of Valuation Allowance, Total | [6] | 17,493,000 |  |  |  |  |  |  |  |  |
Other Assets, Total |  |  |  | 109,548,000 |  |  | 105,298,000 | [2] |  |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  | $ 5,880,000 |  |  |  |  |  |  |  |  |
SBA CARES Act Paycheck Protection Program, First Round [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Deferred Payments, Forgiven Amount |  |  |  | $ 48,270,000 |  |  |  |  |  |  |
Financing Receivable, Percentage of Loans Forgiven from Total Loans with Deferred Payments |  |  |  | 79.15% |  |  |  |  |  |  |
SBA CARES Act Paycheck Protection Program, Second Round [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Deferred Payments, Forgiven Amount |  |  |  | $ 2,560,000 |  |  |  |  |  |  |
Financing Receivable, Percentage of Loans Forgiven from Total Loans with Deferred Payments |  |  |  | 8.11% |  |  |  |  |  |  |
Consumer Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  |  |  | $ 11,055,000 |  | $ 11,887,000 | 8,951,000 |  | $ 7,294,000 | $ 7,519,000 | $ 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 |  |  |  |  |  |  |
Consumer Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | SBA CARES Act Paycheck Protection Program, First Round [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Total |  |  |  | 60,990,000 |  |  |  |  |  |  |
Consumer Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | SBA CARES Act Paycheck Protection Program, Second Round [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Total |  |  |  | 31,590,000 |  |  |  |  |  |  |
Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Off-Balance Sheet, Credit Loss, Liability, Ending Balance |  |  |  | $ 528,000 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | [1] | (5,871,000) |  |  |  |  |  |  |  |  |
Off-Balance Sheet, Credit Loss, Liability, Ending Balance | [3] | 509,000 |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  | 13,107,000 | [4] |  |  |  | 13,107,000 |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Total | [6] | $ 1,813,000 |  |  |  |  |  |  |  |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  |  |  | $ 4,145,000 |  |  |  |
[1] | Net adjustment to retained earnings related to the adoption of ASU 2016-13.
[2] | Derived from audited financial statements
[3] | Adjustment to the reserve for unfunded commitments related to the adoption of ASU 2016-13.
[4] | Calculated adjustment to the ACL related to the adoption of ASU 2016-13. Additional reserve related to purchased deteriorated loans of $5.88 million.
[5] | Effective January 1, 2021, the Company adopted the current expected credit loss methodology ("CECL"), prior to January 1, 2021, the Company utilized the incurred credit loss methodology.
[6] | 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.

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