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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.