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Note 8 - Loans Disaggregated by Impairment Method (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 10,765 $ 10,464 $ 9,887 $ 9,494 $ 9,164 $ 8,834
Allowance for loan losses - individually evaluated for impairment 3,707   3,566      
Allowance for loan losses - collectively evaluated for impairment 6,719   6,065      
Loans and leases receivable 890,113   820,419      
Loans - individually evaluated for impairment 15,036   16,860      
Loans - collectively evaluated for impairment 875,077   803,559      
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 4,820 4,270 4,689 3,947 3,302 3,092
Allowance for loan losses - individually evaluated for impairment 3,268   3,307      
Allowance for loan losses - collectively evaluated for impairment 1,552   1,382      
Loans and leases receivable 227,448   168,031      
Loans - individually evaluated for impairment 5,025   6,027      
Loans - collectively evaluated for impairment 222,423   162,004      
Commercial Portfolio Segment [Member] | Construction Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 301 287 590 588 675 551
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 301   590      
Loans and leases receivable 50,187   56,209      
Loans - collectively evaluated for impairment 50,187   56,209      
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 3,269 3,423 2,519 2,861 2,913 2,824
Allowance for loan losses - individually evaluated for impairment 375   217      
Allowance for loan losses - collectively evaluated for impairment 2,894   2,302      
Loans and leases receivable 351,012   336,050      
Loans - individually evaluated for impairment 6,459   7,172      
Loans - collectively evaluated for impairment 344,553   328,878      
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 834 721 629 714 722 754
Allowance for loan losses - individually evaluated for impairment 52   31      
Allowance for loan losses - collectively evaluated for impairment 782   598      
Loans and leases receivable 80,278   72,443      
Loans - individually evaluated for impairment 1,940   2,082      
Loans - collectively evaluated for impairment 78,338   70,361      
State and Political Subdivisions Portfolio Segment [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 121 120 115 246 201 153
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 121   115      
Loans and leases receivable 34,489   38,376      
Loans - individually evaluated for impairment 0   0      
Loans - collectively evaluated for impairment 34,489   38,376      
Retail Portfolio Segment [Member] | Consumer Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 267 268 230 201 188 164
Allowance for loan losses - individually evaluated for impairment 9   11      
Allowance for loan losses - collectively evaluated for impairment 258   219      
Loans and leases receivable 5,490   6,530      
Loans - individually evaluated for impairment 63   69      
Loans - collectively evaluated for impairment 5,427   6,461      
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 527 586 549 418 433 497
Allowance for loan losses - collectively evaluated for impairment 527   549      
Loans and leases receivable 76,020   69,469      
Loans - individually evaluated for impairment 810   955      
Loans - collectively evaluated for impairment 75,210   68,514      
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 287 266 310 318 294 338
Allowance for loan losses - individually evaluated for impairment 3   0      
Allowance for loan losses - collectively evaluated for impairment 284   310      
Loans and leases receivable 65,189   73,311      
Loans - individually evaluated for impairment 739   555      
Loans - collectively evaluated for impairment 64,450   72,756      
Unallocated Financing Receivables [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 339 $ 523 $ 256 $ 201 $ 436 $ 461