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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