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Note 8 - Loans Disaggregated by Impairment Method (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 9,494 $ 9,164 $ 8,834 $ 8,645 $ 8,192 $ 7,841
Allowance for loan losses - individually evaluated for impairment 2,356   1,664      
Allowance for loan losses - collectively evaluated for impairment 6,937   6,709      
Loans and leases receivable 830,325   785,208      
Loans - individually evaluated for impairment 9,900   16,482      
Loans - collectively evaluated for impairment 820,425   768,726      
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 3,947 3,302 3,092 3,027 2,840 2,711
Allowance for loan losses - individually evaluated for impairment 2,282   1,461      
Allowance for loan losses - collectively evaluated for impairment 1,665   1,631      
Loans and leases receivable 161,869   162,452      
Loans - individually evaluated for impairment 3,521   7,128      
Loans - collectively evaluated for impairment 158,348   155,324      
Commercial Portfolio Segment [Member] | Construction Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 588 675 551 594 573 563
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 588   551      
Loans and leases receivable 53,450   50,135      
Loans - collectively evaluated for impairment 53,450   50,135      
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 2,861 2,913 2,824 3,003 2,710 2,410
Allowance for loan losses - individually evaluated for impairment 8   101      
Allowance for loan losses - collectively evaluated for impairment 2,853   2,723      
Loans and leases receivable 340,108   308,590      
Loans - individually evaluated for impairment 2,994   6,083      
Loans - collectively evaluated for impairment 337,114   302,507      
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 714 722 754 863 781 816
Allowance for loan losses - individually evaluated for impairment 49   97      
Allowance for loan losses - collectively evaluated for impairment 665   657      
Loans and leases receivable 73,121   68,581      
Loans - individually evaluated for impairment 1,626   1,740      
Loans - collectively evaluated for impairment 71,495   66,841      
State and Political Subdivisions Portfolio Segment [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 246 201 153 260 190 114
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 246   153      
Loans and leases receivable 54,684   43,737      
Loans - individually evaluated for impairment 0   0      
Loans - collectively evaluated for impairment 54,684   43,737      
Retail Portfolio Segment [Member] | Consumer Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 201 188 164 60 67 57
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 201   164      
Loans and leases receivable 6,637   6,785      
Loans - individually evaluated for impairment 71   77      
Loans - collectively evaluated for impairment 6,566   6,708      
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 418 433 497 461 509 444
Allowance for loan losses - individually evaluated for impairment 17          
Allowance for loan losses - collectively evaluated for impairment 401   497      
Loans and leases receivable 67,889   67,453      
Loans - individually evaluated for impairment 1,120   1,268      
Loans - collectively evaluated for impairment 66,769   66,185      
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 318 294 338 318 311 357
Allowance for loan losses - individually evaluated for impairment 0   5      
Allowance for loan losses - collectively evaluated for impairment 318   333      
Loans and leases receivable 72,567   77,475      
Loans - individually evaluated for impairment 568   186      
Loans - collectively evaluated for impairment 71,999   77,289      
Unallocated Financing Receivables [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 201 $ 436 $ 461 $ 59 $ 211 $ 369