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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.