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Note 3 - Loans - Impaired Loan Balances by Portfolio Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Recorded investment, with no related allowance recorded $ 2,743 $ 2,852
Unpaid principal balance, with no related allowance recorded 2,735 2,849
Average recorded investment, with no related allowance recorded 2,798 2,907
Interest income recognized, with no related allowance recorded 37 212
Commercial Portfolio Segment [Member]    
Recorded investment, with no related allowance recorded 0 18
Unpaid principal balance, with no related allowance recorded 0 18
Average recorded investment, with no related allowance recorded 9 23
Interest income recognized, with no related allowance recorded 0 6
Recorded investment, with a related allowance recorded 36 39
Unpaid principal balance, with a related allowance recorded 29 33
Related allowance 26 29
Average recorded investment, with a related allowance recorded 38 382
Interest income recognized, with a related allowance recorded 1 15
Recorded investment 36 57
Unpaid principal balance 29 51
Average recorded investment 47 405
Interest income recognized 1 21
Commercial Real Estate Portfolio Segment [Member] | Construction and Land Development [Member]    
Recorded investment, with no related allowance recorded 0 0
Unpaid principal balance, with no related allowance recorded 0 0
Average recorded investment, with no related allowance recorded 0 0
Interest income recognized, with no related allowance recorded 0 0
Recorded investment, with a related allowance recorded 0 0
Unpaid principal balance, with a related allowance recorded 0 0
Related allowance 0 0
Average recorded investment, with a related allowance recorded 0 0
Interest income recognized, with a related allowance recorded 0 0
Recorded investment 0 0
Unpaid principal balance 0 0
Average recorded investment 0 0
Interest income recognized 0 0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member]    
Recorded investment, with no related allowance recorded 30 286
Unpaid principal balance, with no related allowance recorded 27 283
Average recorded investment, with no related allowance recorded 158 357
Interest income recognized, with no related allowance recorded 1 27
Recorded investment, with a related allowance recorded 0 0
Unpaid principal balance, with a related allowance recorded 0 0
Related allowance 0 0 [1]
Average recorded investment, with a related allowance recorded 0 0
Interest income recognized, with a related allowance recorded 0 0
Recorded investment 30 122 [1]
Unpaid principal balance 27 122 [1]
Average recorded investment 158 180 [1]
Interest income recognized 1 15 [1]
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member]    
Recorded investment, with no related allowance recorded 1,108 1,148
Unpaid principal balance, with no related allowance recorded 1,107 1,147
Average recorded investment, with no related allowance recorded 1,127 766
Interest income recognized, with no related allowance recorded 17 75
Recorded investment, with a related allowance recorded 0  
Unpaid principal balance, with a related allowance recorded 0  
Related allowance 0 0
Average recorded investment, with a related allowance recorded 61  
Interest income recognized, with a related allowance recorded 0  
Recorded investment 1,108 286
Unpaid principal balance 1,107 283
Average recorded investment 1,188 357
Interest income recognized 17 27
Residential Portfolio Segment [Member] | Residential [Member]    
Recorded investment, with no related allowance recorded 1,429 1,096
Unpaid principal balance, with no related allowance recorded 1,432 1,103
Average recorded investment, with no related allowance recorded 1,263 912
Interest income recognized, with no related allowance recorded 16 62
Recorded investment, with a related allowance recorded 135 137
Unpaid principal balance, with a related allowance recorded 135 137
Related allowance 1 1
Average recorded investment, with a related allowance recorded 136 256
Interest income recognized, with a related allowance recorded 2 9
Recorded investment 1,564 1,233
Unpaid principal balance 1,567 1,240
Average recorded investment 1,399 1,168
Interest income recognized 18 71
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member]    
Recorded investment, with no related allowance recorded 5 6
Unpaid principal balance, with no related allowance recorded 5 6
Average recorded investment, with no related allowance recorded 6 31
Interest income recognized, with no related allowance recorded 0 3
Recorded investment, with a related allowance recorded 0 0
Unpaid principal balance, with a related allowance recorded 0 0
Related allowance 0 0
Average recorded investment, with a related allowance recorded 0 0
Interest income recognized, with a related allowance recorded 0 0
Recorded investment 5 6
Unpaid principal balance 5 6
Average recorded investment 6 31
Interest income recognized 0 3
Consumer Portfolio Segment [Member]    
Recorded investment, with no related allowance recorded 0 0
Unpaid principal balance, with no related allowance recorded 0 0
Average recorded investment, with no related allowance recorded 0 0
Interest income recognized, with no related allowance recorded 0 0
Recorded investment, with a related allowance recorded 0 0
Unpaid principal balance, with a related allowance recorded 0 0
Related allowance 0 0
Average recorded investment, with a related allowance recorded 0 0
Interest income recognized, with a related allowance recorded 0 0
Recorded investment 0 0
Unpaid principal balance 0 0
Average recorded investment 0 0
Interest income recognized $ 0 $ 0
[1] Allowance is reported as zero in the table due to presentation in thousands and rounding.