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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Recorded investment with no allowance $ 155 $ 288  
Unpaid principal balance with no allowance 155 296  
Average recorded investment with no allowance 214 241 $ 3,077
Interest income recognized with no allowance 0 0 81
Recorded investment with allowance 1,935 2,315  
Unpaid principal balance with allowance 2,115 2,468  
Related allowance 155 7  
Average recorded investment with allowance 2,052 2,912 193
Interest income recognized with allowance 45 65 0
Average recorded investment     3,270
Interest income recognized     81
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Recorded investment with no allowance 854 1,034  
Unpaid principal balance with no allowance 996 1,163  
Average recorded investment with no allowance 893 1,529 1,638
Interest income recognized with no allowance 12 21 22
Recorded investment with allowance 0 0  
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 11 0 117
Interest income recognized with allowance 0 0 0
Recorded investment 854 1,034  
Unpaid principal balance 996 1,163  
Average recorded investment 904 1,529 1,755
Interest income recognized 12 21 22
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]      
Recorded investment with no allowance 51 102  
Unpaid principal balance with no allowance 51 104  
Average recorded investment with no allowance 71 100 101
Interest income recognized with no allowance 0 0 1
Recorded investment with allowance 0 0  
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 10 0
Interest income recognized with allowance 0 0 0
Recorded investment 51 102  
Unpaid principal balance 51 104  
Average recorded investment 71 110 101
Interest income recognized 0 0 1
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]      
Recorded investment with no allowance 0 0  
Unpaid principal balance with no allowance 0 0  
Average recorded investment with no allowance 0 0 0
Interest income recognized with no allowance 0 0 0
Recorded investment with allowance 0 0  
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 0 0
Interest income recognized with allowance 0 0 0
Recorded investment 0 0  
Unpaid principal balance 0 0  
Average recorded investment 0 0 0
Interest income recognized 0 0 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Recorded investment with no allowance 463 702  
Unpaid principal balance with no allowance 484 716  
Average recorded investment with no allowance 582 740 836
Interest income recognized with no allowance 25 34 36
Recorded investment with allowance 0 0  
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 0 0
Interest income recognized with allowance 0 0 0
Recorded investment 463 702  
Unpaid principal balance 484 716  
Average recorded investment 582 740 836
Interest income recognized 25 34 36
Commercial Portfolio Segment [Member]      
Recorded investment with no allowance 40 174  
Unpaid principal balance with no allowance 40 174  
Average recorded investment with no allowance 137 191 249
Interest income recognized with no allowance 8 8 9
Recorded investment with allowance 155 0  
Unpaid principal balance with allowance 155 0  
Related allowance 155 0  
Average recorded investment with allowance 31 0 76
Interest income recognized with allowance 0 0 0
Recorded investment 195 174  
Unpaid principal balance 195 174  
Average recorded investment 168 191 325
Interest income recognized 8 8 9
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 372 15  
Unpaid principal balance with no allowance 389 15  
Average recorded investment with no allowance 155 111 234
Interest income recognized with no allowance 0 2 13
Recorded investment with allowance 0 288  
Unpaid principal balance with allowance 0 296  
Related allowance 0 7  
Average recorded investment with allowance 172 231 0
Interest income recognized with allowance 0 0 0
Recorded investment 372 303  
Unpaid principal balance 389 311  
Average recorded investment 327 342 234
Interest income recognized 0 2 13
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 0 0  
Unpaid principal balance with no allowance 0 0  
Average recorded investment with no allowance 0 0 19
Interest income recognized with no allowance 0 0 0
Recorded investment with allowance 0 0  
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 0 0
Interest income recognized with allowance 0 0 0
Recorded investment 0 0  
Unpaid principal balance 0 0  
Average recorded investment 0 0 19
Interest income recognized $ 0 $ 0 $ 0