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Note 8 - Loans Disaggregated by Impairment Method (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 11,202 $ 11,115 $ 10,826 $ 10,464 $ 10,334 $ 9,887
Allowance for loan losses - individually evaluated for impairment 3,107   3,050      
Allowance for loan losses - collectively evaluated for impairment 7,725   7,226      
Loans and leases receivable 922,815   921,856      
Loans - individually evaluated for impairment 12,908   14,516      
Loans - collectively evaluated for impairment 909,907   907,340      
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 3,644 3,916 4,050 4,270 4,657 4,689
Allowance for loan losses - individually evaluated for impairment 2,207   2,421      
Allowance for loan losses - collectively evaluated for impairment 1,437   1,629      
Loans and leases receivable 191,900   227,431      
Loans - individually evaluated for impairment 3,706   4,503      
Loans - collectively evaluated for impairment 188,194   222,928      
Commercial Portfolio Segment [Member] | Construction Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 297 313 346 287 286 590
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 297   346      
Loans and leases receivable 49,411   57,594      
Loans - collectively evaluated for impairment 49,411   57,594      
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 4,239 4,094 3,736 3,423 3,286 2,519
Allowance for loan losses - individually evaluated for impairment 363   432      
Allowance for loan losses - collectively evaluated for impairment 3,876   3,304      
Loans and leases receivable 417,984   377,586      
Loans - individually evaluated for impairment 5,735   6,323      
Loans - collectively evaluated for impairment 412,249   371,263      
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 1,172 825 871 721 608 629
Allowance for loan losses - individually evaluated for impairment 425   73      
Allowance for loan losses - collectively evaluated for impairment 747   798      
Loans and leases receivable 80,412   81,897      
Loans - individually evaluated for impairment 1,738   2,051      
Loans - collectively evaluated for impairment 78,674   79,846      
State and Political Subdivisions Portfolio Segment [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 84 86 89 120 134 115
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 84   89      
Loans and leases receivable 24,085   25,302      
Loans - individually evaluated for impairment 0   0      
Loans - collectively evaluated for impairment 24,085   25,302      
Retail Portfolio Segment [Member] | Consumer Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 494 263 265 268 278 230
Allowance for loan losses - individually evaluated for impairment 7   7      
Allowance for loan losses - collectively evaluated for impairment 487   258      
Loans and leases receivable 4,945   5,364      
Loans - individually evaluated for impairment 57   61      
Loans - collectively evaluated for impairment 4,888   5,303      
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 541 610 533 586 660 549
Allowance for loan losses - collectively evaluated for impairment 541   533      
Loans and leases receivable 91,100   82,739      
Loans - individually evaluated for impairment 922   813      
Loans - collectively evaluated for impairment 90,178   81,926      
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 361 368 386 266 333 310
Allowance for loan losses - individually evaluated for impairment 105   117      
Allowance for loan losses - collectively evaluated for impairment 256   269      
Loans and leases receivable 62,978   63,943      
Loans - individually evaluated for impairment 750   765      
Loans - collectively evaluated for impairment 62,228   63,178      
Unallocated Financing Receivables [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 370 $ 640 $ 550 $ 523 $ 92 $ 256