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Note 4 - Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Recorded investment with no allowance $ 155  
Unpaid principal balance with no allowance 155  
Average recorded investment with no allowance 214 $ 2,671
Interest income recognized with no allowance 0 65
Recorded investment with allowance 1,935  
Unpaid principal balance with allowance 2,115  
Related allowance 155  
Average recorded investment with allowance 2,052 241
Interest income recognized with allowance 45 0
Average recorded investment   2,912
Interest income recognized   65
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment with no allowance 854  
Unpaid principal balance with no allowance 996  
Average recorded investment with no allowance 893 1,529
Interest income recognized with no allowance 12 21
Recorded investment with allowance 0  
Unpaid principal balance with allowance 0  
Related allowance 0  
Average recorded investment with allowance 11 0
Interest income recognized with allowance 0 0
Recorded investment 854  
Unpaid principal balance 996  
Average recorded investment 904 1,529
Interest income recognized 12 21
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Recorded investment with no allowance 51  
Unpaid principal balance with no allowance 51  
Average recorded investment with no allowance 71 100
Interest income recognized with no allowance 0 0
Recorded investment with allowance 0  
Unpaid principal balance with allowance 0  
Related allowance 0  
Average recorded investment with allowance 0 10
Interest income recognized with allowance 0 0
Recorded investment 51  
Unpaid principal balance 51  
Average recorded investment 71 110
Interest income recognized 0 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Recorded investment with no allowance 0  
Unpaid principal balance with no allowance 0  
Average recorded investment with no allowance 0 0
Interest income recognized with no allowance 0 0
Recorded investment with allowance 0  
Unpaid principal balance with allowance 0  
Related allowance 0  
Average recorded investment with allowance 0 0
Interest income recognized with allowance 0 0
Recorded investment 0  
Unpaid principal balance 0  
Average recorded investment 0 0
Interest income recognized 0 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment with no allowance 463  
Unpaid principal balance with no allowance 484  
Average recorded investment with no allowance 582 740
Interest income recognized with no allowance 25 34
Recorded investment with allowance 0  
Unpaid principal balance with allowance 0  
Related allowance 0  
Average recorded investment with allowance 0 0
Interest income recognized with allowance 0 0
Recorded investment 463  
Unpaid principal balance 484  
Average recorded investment 582 740
Interest income recognized 25 34
Commercial Portfolio Segment [Member]    
Recorded investment with no allowance 40  
Unpaid principal balance with no allowance 40  
Average recorded investment with no allowance 137 191
Interest income recognized with no allowance 8 8
Recorded investment with allowance 155  
Unpaid principal balance with allowance 155  
Related allowance 155  
Average recorded investment with allowance 31 0
Interest income recognized with allowance 0 0
Recorded investment 195  
Unpaid principal balance 195  
Average recorded investment 168 191
Interest income recognized 8 8
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Recorded investment with no allowance 372  
Unpaid principal balance with no allowance 389  
Average recorded investment with no allowance 155 111
Interest income recognized with no allowance 0 2
Recorded investment with allowance 0  
Unpaid principal balance with allowance 0  
Related allowance 0  
Average recorded investment with allowance 172 231
Interest income recognized with allowance 0 0
Recorded investment 372  
Unpaid principal balance 389  
Average recorded investment 327 342
Interest income recognized 0 2
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Recorded investment with no allowance 0  
Unpaid principal balance with no allowance 0  
Average recorded investment with no allowance 0 0
Interest income recognized with no allowance 0 0
Recorded investment with allowance 0  
Unpaid principal balance with allowance 0  
Related allowance 0  
Average recorded investment with allowance 0 0
Interest income recognized with allowance 0 0
Recorded investment 0  
Unpaid principal balance 0  
Average recorded investment 0 0
Interest income recognized $ 0 $ 0