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Note 8 - Loans Disaggregated by Impairment Method (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 11,297 $ 11,231 $ 11,184 $ 11,202 $ 11,115 $ 10,826
Allowance for loan losses - individually evaluated for impairment 1,972   2,873      
Allowance for loan losses - collectively evaluated for impairment 8,593   7,806      
Loans and leases receivable 963,712   927,147      
Loans - individually evaluated for impairment 11,770   12,192      
Loans - collectively evaluated for impairment 951,942   914,955      
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 2,710 3,192 3,368 3,644 3,916 4,050
Allowance for loan losses - individually evaluated for impairment 1,397   2,090      
Allowance for loan losses - collectively evaluated for impairment 1,313   1,278      
Loans and leases receivable 144,516   148,610      
Loans - individually evaluated for impairment 3,360   3,517      
Loans - collectively evaluated for impairment 141,156   145,093      
Commercial Portfolio Segment [Member] | Construction Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 687 709 363 297 313 346
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 687   363      
Loans and leases receivable 59,772   55,855      
Loans - collectively evaluated for impairment 59,772   55,855      
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 4,336 3,813 4,280 4,239 4,094 3,736
Allowance for loan losses - individually evaluated for impairment 110   312      
Allowance for loan losses - collectively evaluated for impairment 4,226   3,968      
Loans and leases receivable 475,066   451,404      
Loans - individually evaluated for impairment 5,511   5,654      
Loans - collectively evaluated for impairment 469,555   445,750      
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 1,181 1,029 1,035 1,172 825 871
Allowance for loan losses - individually evaluated for impairment 340   368      
Allowance for loan losses - collectively evaluated for impairment 841   667      
Loans and leases receivable 94,900   84,741      
Loans - individually evaluated for impairment 1,413   1,387      
Loans - collectively evaluated for impairment 93,487   83,354      
State and Political Subdivisions Portfolio Segment [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 77 68 69 84 86 89
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 77   69      
Loans and leases receivable 19,202   19,775      
Loans - individually evaluated for impairment 0   0      
Loans - collectively evaluated for impairment 19,202   19,775      
Retail Portfolio Segment [Member] | Consumer Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 482 588 542 494 263 265
Allowance for loan losses - individually evaluated for impairment 0   3      
Allowance for loan losses - collectively evaluated for impairment 482   539      
Loans and leases receivable 4,398   4,699      
Loans - individually evaluated for impairment 49   53      
Loans - collectively evaluated for impairment 4,349   4,646      
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 680 665 646 541 610 533
Allowance for loan losses - collectively evaluated for impairment 680   646      
Loans and leases receivable 105,659   100,281      
Loans - individually evaluated for impairment 965   893      
Loans - collectively evaluated for impairment 104,694   99,388      
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 412 398 376 361 368 386
Allowance for loan losses - individually evaluated for impairment 125   100      
Allowance for loan losses - collectively evaluated for impairment 287   276      
Loans and leases receivable 60,199   61,782      
Loans - individually evaluated for impairment 472   688      
Loans - collectively evaluated for impairment 59,727   61,094      
Unallocated Financing Receivables [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 732 $ 769 $ 505 $ 370 $ 640 $ 550