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Note 5 - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance $ 4,633 $ 6,432  
Unpaid principal balance - with no specific allowance 5,215 7,472  
Recorded investment - with an allowance 7,559 8,084  
Unpaid principal balance - with an allowance 8,324 9,834  
Related allowance 2,873 3,050  
Unpaid principal balance 13,539 17,306  
Recorded investment 12,192 14,516  
Average recorded investment 12,998 15,467 $ 12,389
Interest income recognized 240 256 148
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 150 647  
Unpaid principal balance - with no specific allowance 157 722  
Recorded investment - with an allowance 3,367 3,856  
Unpaid principal balance - with an allowance 3,825 5,462  
Related allowance 2,090 2,421  
Unpaid principal balance 3,982 6,184  
Recorded investment 3,517 4,503  
Average recorded investment 3,782 5,204 4,603
Interest income recognized 5 5 1
Commercial Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 0 0  
Unpaid principal balance - with no specific allowance 0 0  
Recorded investment - with an allowance 0 0  
Unpaid principal balance - with an allowance 0 0  
Related allowance 0 0  
Unpaid principal balance 0 0  
Recorded investment 0 0  
Average recorded investment 0 0 0
Interest income recognized 0 0 0
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 2,361 3,018  
Unpaid principal balance - with no specific allowance 2,702 3,671  
Recorded investment - with an allowance 3,293 3,305  
Unpaid principal balance - with an allowance 3,451 3,418  
Related allowance 312 432  
Unpaid principal balance 6,153 7,089  
Recorded investment 5,654 6,323  
Average recorded investment 5,813 6,696 4,682
Interest income recognized 167 171 94
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 715 1,417  
Unpaid principal balance - with no specific allowance 768 1,608  
Recorded investment - with an allowance 672 634  
Unpaid principal balance - with an allowance 787 642  
Related allowance 368 73  
Unpaid principal balance 1,555 2,250  
Recorded investment 1,387 2,051  
Average recorded investment 1,706 2,002 1,713
Interest income recognized 61 69 40
Retail Portfolio Segment [Member] | Consumer Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 0 0  
Unpaid principal balance - with no specific allowance 0 0  
Recorded investment - with an allowance 53 61  
Unpaid principal balance - with an allowance 68 73  
Related allowance 3 7  
Unpaid principal balance 68 73  
Recorded investment 53 61  
Average recorded investment 57 66 73
Interest income recognized 1 0 0
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 893 813  
Unpaid principal balance - with no specific allowance 1,002 894  
Recorded investment - with an allowance 0 0  
Unpaid principal balance - with an allowance 0 0  
Related allowance 0 0  
Unpaid principal balance 1,002 894  
Recorded investment 893 813  
Average recorded investment 902 819 1,037
Interest income recognized 6 10 12
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 514 537  
Unpaid principal balance - with no specific allowance 586 577  
Recorded investment - with an allowance 174 228  
Unpaid principal balance - with an allowance 193 239  
Related allowance 100 117  
Unpaid principal balance 779 816  
Recorded investment 688 765  
Average recorded investment 738 680 281
Interest income recognized 0 1 1
State and Political Subdivisions Portfolio Segment [Member]      
Financing Receivable Impaired [Line Items]      
Average recorded investment 0 0 0
Interest income recognized $ 0 $ 0 $ 0