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Note 1 - Basis of Presentation (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended
May 01, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of Operating Segments   1        
Financing Receivable, Number of Payment Deferrals   154        
Financing Receivable, Deferred Payments   $ 6,610        
Retained Earnings (Accumulated Deficit), Ending Balance   222,814   $ 219,535 [1]    
Loans and Leases Receivable, Allowance, Ending Balance   21,137   18,425 [1] $ 18,243 $ 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]            
Loans and Leases Receivable, Allowance, Ending Balance   12,075   10,235 10,065 10,499
Consumer Real Estate Portfolio Segment [Member]            
Loans and Leases Receivable, Allowance, Ending Balance   $ 7,519   $ 6,325 $ 6,856 $ 6,732
Subsequent Event [Member]            
Financing Receivable, Number of Payment Deferrals 2,176          
Financing Receivable, Deferred Payments $ 327,520          
Financing Receivable, Number Closed Under Paycheck Protection Program Under CARES Act 234          
Financing Receivable, Loans Closed Under Paycheck Protection Program Under CARES Act, Proceeds $ 37,680          
Financing Receivable, Number Approved Under Paycheck Protection Program Under CARES Act 407          
Financing Receivable, Loans Expected to Close Under Paycheck Protection Program Under CARES Act, Proceeds $ 20,580          
Subsequent Event [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Number of Payment Deferrals 887          
Financing Receivable, Deferred Payments $ 254,720          
Subsequent Event [Member] | Consumer Portfolio Segment [Member]            
Financing Receivable, Number of Payment Deferrals 698          
Financing Receivable, Deferred Payments $ 9,220          
Subsequent Event [Member] | Consumer Real Estate Portfolio Segment [Member] | Residential Mortgage [Member]            
Financing Receivable, Number of Payment Deferrals 484          
Financing Receivable, Deferred Payments $ 57,470          
Subsequent Event [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity Loan [Member]            
Financing Receivable, Number of Payment Deferrals 107          
Financing Receivable, Deferred Payments $ 6,100          
[1] Derived from audited financial statements