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Note 1 - Basis of Presentation and Significant Accounting Policies (Details Textual) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 31, 2020 USD ($) | Oct. 31, 2018 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2020 USD ($)
Number of Operating Segments |  |  |  |  | 1 |  |  |
Minimum Principal Balance of Loans for Quarterly Rating Review |  |  |  |  | $ 500 |  |  |
Restructured Loans, Reserves |  |  |  |  | $ 500 |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  |  |  |  | 10 years |  |  |
Number of Reportable Segments |  |  |  |  | 1 |  |  |
Goodwill, Impairment Loss | $ 0 | $ 1,490 |  | $ 1,490 | $ 0 | $ 0 | $ 1,492 |
Financing Receivable, Number of Payment Deferrals |  |  |  |  | 3,625 |  |  |
Financing Receivable, Deferred Payments |  |  |  |  | $ 458,170 |  |  | $ 436,110
Loans and Leases Receivable, Allowance, Ending Balance |  |  |  |  | 26,182 | 18,425 | 18,267 |
Reserve for Unfunded Credit Commitments |  |  |  |  | 66 | 66 |  |
Forecast [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance, Ending Balance |  |  | $ 39,290 |  |  |  |  |
Reserve for Unfunded Credit Commitments |  |  | 576 |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease), Total |  |  | $ (5,870) |  |  |  |  |
SBA CARES Act Paycheck Protection Program [Member] |  |  |  |  |  |  |  |
Financing Receivable, Deferred Payments, Forgiven Amount |  |  |  |  | $ 3,940 |  |  |
Financing Receivable, Percentage of Loans Forgiven from Total Loans with Deferred Payments |  |  |  |  | 6.46% |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Deferred Payments |  |  |  |  | $ 26,540 |  |  |
Loans and Leases Receivable, Allowance, Ending Balance |  |  |  |  | 14,661 | 10,235 | 10,499 |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Deferred Payments |  |  |  |  | 5,720 |  |  |
Consumer Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance, Ending Balance |  |  |  |  | $ 8,951 | 6,325 | $ 6,732 |
Consumer Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] |  |  |  |  |  |  |  |
Financing Receivable, Number Closed Under Paycheck Protection Program Under CARES Act |  |  |  |  | 803 |  |  |
Loans and Leases Receivable, Gross, Total |  |  |  |  | $ 62,740 |  |  |
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 |  |  |  |  | $ 3,930 | 3,680 |  |
Investment in Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock [Member] |  |  |  |  |  |  |  |
Investment Owned, at Cost |  |  |  |  | $ 10,800 | $ 8,900 |  |

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