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Note 1 - Basis of Presentation (Details Textual)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of Operating Segments 1            
Financing Receivable, Number of Payment Deferrals 3,362            
Financing Receivable, Deferred Payments $ 426,450            
Retained Earnings (Accumulated Deficit), Ending Balance 230,464     $ 219,535 [1]      
Loans and Leases Receivable, Allowance, Ending Balance 27,277   $ 23,758 18,425 [1] $ 18,493 $ 18,540 $ 18,267
Financial Asset Acquired with Credit Deterioration [Member]              
Loans and Leases Receivable, Allowance, Ending Balance 0            
Accounting Standards Update 2016-13 [Member] | Forecast [Member]              
Loans and Leases Receivable, Allowance, Ending Balance   $ 2,890          
Accounting Standards Update 2016-13 [Member] | Forecast [Member] | Highlands [Member]              
Loans and Leases Receivable, Allowance, Ending Balance   4,440          
Accounting Standards Update 2016-13 [Member] | Forecast [Member] | Highlands [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Loans and Leases Receivable, Allowance, Ending Balance   7,040          
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Forecast [Member]              
Retained Earnings (Accumulated Deficit), Ending Balance   $ 5,610          
Commercial Portfolio Segment [Member]              
Financing Receivable, Deferred Payments 102,540            
Loans and Leases Receivable, Allowance, Ending Balance 15,549   13,909 10,235 10,299 10,215 10,499
Commercial Portfolio Segment [Member] | Home Equity Loan [Member]              
Financing Receivable, Deferred Payments 69,320            
Consumer Portfolio Segment [Member]              
Financing Receivable, Deferred Payments 13,090            
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]              
Financing Receivable, Deferred Payments 5,090            
Consumer Real Estate Portfolio Segment [Member]              
Loans and Leases Receivable, Allowance, Ending Balance $ 9,119   $ 7,294 $ 6,325 $ 6,386 $ 6,881 $ 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            
[1] Derived from audited financial statements