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Note 5 - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance $ 4,943 $ 4,633  
Unpaid principal balance - with no specific allowance 5,820 5,215  
Recorded investment - with an allowance 4,624 7,559  
Unpaid principal balance - with an allowance 5,169 8,324  
Related allowance 696 2,873  
Unpaid principal balance 10,989 13,539  
Recorded investment 9,567 12,192  
Average recorded investment 11,274 12,998 $ 15,467
Interest income recognized 214 240 256
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 1,402 150  
Unpaid principal balance - with no specific allowance 1,694 157  
Recorded investment - with an allowance 419 3,367  
Unpaid principal balance - with an allowance 601 3,825  
Related allowance 125 2,090  
Unpaid principal balance 2,295 3,982  
Recorded investment 1,821 3,517  
Average recorded investment 3,001 3,782 5,204
Interest income recognized 10 5 5
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 2,198 2,361  
Unpaid principal balance - with no specific allowance 2,608 2,702  
Recorded investment - with an allowance 3,111 3,293  
Unpaid principal balance - with an allowance 3,312 3,451  
Related allowance 131 312  
Unpaid principal balance 5,920 6,153  
Recorded investment 5,309 5,654  
Average recorded investment 5,499 5,813 6,696
Interest income recognized 144 167 171
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 430 715  
Unpaid principal balance - with no specific allowance 482 768  
Recorded investment - with an allowance 932 672  
Unpaid principal balance - with an allowance 1,065 787  
Related allowance 321 368  
Unpaid principal balance 1,547 1,555  
Recorded investment 1,362 1,387  
Average recorded investment 1,368 1,706 2,002
Interest income recognized 53 61 69
Retail Portfolio Segment [Member] | Consumer Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 45 0  
Unpaid principal balance - with no specific allowance 62 0  
Recorded investment - with an allowance 0 53  
Unpaid principal balance - with an allowance 0 68  
Related allowance 0 3  
Unpaid principal balance 62 68  
Recorded investment 45 53  
Average recorded investment 49 57 66
Interest income recognized 0 1 0
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 628 893  
Unpaid principal balance - with no specific allowance 678 1,002  
Recorded investment - with an allowance 0 0  
Unpaid principal balance - with an allowance 0 0  
Related allowance 0 0  
Unpaid principal balance 678 1,002  
Recorded investment 628 893  
Average recorded investment 871 902 819
Interest income recognized 6 6 10
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 240 514  
Unpaid principal balance - with no specific allowance 296 586  
Recorded investment - with an allowance 162 174  
Unpaid principal balance - with an allowance 191 193  
Related allowance 119 100  
Unpaid principal balance 487 779  
Recorded investment 402 688  
Average recorded investment 486 738 680
Interest income recognized $ 1 $ 0 $ 1