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Note 1 - Basis of Presentation (Details Textual)
3 Months Ended
Jan. 01, 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] $ 241,889,000 $ 237,585,000 [2]      
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total   406,000        
Minimum Principal Balance of Loans for Quarterly Rating Review   500,000        
Financing Receivable, Accrued Interest, after Allowance for Credit Loss   8,310,000        
Off-Balance Sheet, Credit Loss, Liability, Ending Balance [3] 66,000          
Financing Receivable, Deferred Payments   17,480,000   $ 436,110,000    
Financing Receivable, Allowance for Credit Loss, Ending Balance 26,182,000 [4] 34,563,000 26,182,000   $ 21,137,000 $ 18,425,000
Deferred Tax Assets, Net of Valuation Allowance, Total [5] 17,493,000          
Other Assets, Total   106,543,000 104,075,000 [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 [Member]            
Financing Receivable, Deferred Payments, Forgiven Amount   $ 32,730,000        
Financing Receivable, Percentage of Loans Forgiven from Total Loans with Deferred Payments   39.21%        
Financing Receivable, Percentage of Loans Forgiven from First Round Balances   53.58%        
Consumer Real Estate Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss, Ending Balance   $ 11,887,000 8,951,000   $ 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   1,165        
Loans and Leases Receivable, Gross, Total   $ 85,210,000        
Other Liabilities [Member]            
Off-Balance Sheet, Credit Loss, Liability, Ending Balance   $ 465,000        
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 [5] $ 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] 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.