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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Recorded investment with no allowance $ 3,168 $ 2,558  
Unpaid principal balance with no allowance 3,338 2,818  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 3,077 3,154 $ 3,198
Interest income recognized with no allowance 81 62 55
Recorded investment with allowance 0 189  
Unpaid principal balance with allowance 0 211  
Related allowance 0 16  
Average recorded investment with allowance 193 239 288
Interest income recognized with allowance 0 0 0
Recorded investment 3,168 2,747  
Unpaid principal balance 3,338 3,029  
Average recorded investment 3,270 3,393 3,486
Interest income recognized 81 62 55
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Recorded investment with no allowance 1,728 1,737  
Unpaid principal balance with no allowance 1,902 1,986  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 1,638 1,973 2,335
Interest income recognized with no allowance 22 17 23
Recorded investment with allowance 0 189  
Unpaid principal balance with allowance 0 211  
Related allowance 0 16  
Average recorded investment with allowance 117 87 203
Interest income recognized with allowance 0 0 0
Recorded investment 1,728 1,926  
Unpaid principal balance 1,902 2,197  
Average recorded investment 1,755 2,060 2,538
Interest income recognized 22 17 23
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]      
Recorded investment with no allowance 97 115  
Unpaid principal balance with no allowance 97 117  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 101 147 135
Interest income recognized with no allowance 1 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 97 115  
Unpaid principal balance 97 117  
Average recorded investment 101 147 135
Interest income recognized 1 0 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]      
Recorded investment with no allowance 0 0  
Unpaid principal balance with no allowance 0 0  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 0 209 104
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 0 209 104
Interest income recognized 0 0 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Recorded investment with no allowance 779 353  
Unpaid principal balance with no allowance 784 352  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 836 446 325
Interest income recognized with no allowance 36 33 16
Recorded investment with allowance 0 0  
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 81 42
Interest income recognized with allowance 0 0 0
Recorded investment 779 353  
Unpaid principal balance 784 352  
Average recorded investment 836 527 367
Interest income recognized 36 33 16
Commercial Portfolio Segment [Member]      
Recorded investment with no allowance 211 249  
Unpaid principal balance with no allowance 210 257  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 249 330 237
Interest income recognized with no allowance 9 11 14
Recorded investment with allowance 0 0  
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 76 58 38
Interest income recognized with allowance 0 0 0
Recorded investment 211 249  
Unpaid principal balance 210 257  
Average recorded investment 325 388 275
Interest income recognized 9 11 14
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 353 56  
Unpaid principal balance with no allowance 345 56  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 234 29 57
Interest income recognized with no allowance 13 1 1
Recorded investment with allowance 0 0  
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 13 5
Interest income recognized with allowance 0 0 0
Recorded investment 353 56  
Unpaid principal balance 345 56  
Average recorded investment 234 42 62
Interest income recognized 13 1 1
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 0 48  
Unpaid principal balance with no allowance 0 50  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 19 20 5
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 0 0
Interest income recognized with allowance 0 0 0
Recorded investment 0 48  
Unpaid principal balance 0 50  
Average recorded investment 19 20 5
Interest income recognized $ 0 $ 0 $ 1