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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Recorded investment with no allowance $ 178   $ 2,558
Unpaid principal balance with no allowance 198   2,818
Related allowance with no allowance    
Average recorded investment with no allowance 184 $ 312  
Interest income recognized with no allowance  
Recorded investment with allowance 2,747   189
Unpaid principal balance with allowance 3,044   211
Related allowance 15   16
Average recorded investment with allowance 2,748 3,868  
Interest income recognized with allowance 18 8  
Recorded investment     2,747
Unpaid principal balance     3,029
Related allowance 15   16
Unpaid principal balance with no allowance 198   2,818
Unpaid principal balance     3,029
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Recorded investment with no allowance 1,662   1,737
Unpaid principal balance with no allowance 1,927   1,986
Related allowance with no allowance  
Average recorded investment with no allowance 1,700 2,181  
Interest income recognized with no allowance 6 3  
Recorded investment with allowance 178   189
Unpaid principal balance with allowance 198   211
Related allowance 15   16
Average recorded investment with allowance 184 76  
Interest income recognized with allowance  
Recorded investment 1,840   1,926
Unpaid principal balance 2,125   2,197
Related allowance 15   16
Average recorded investment 1,884 2,257  
Interest income recognized 6 3  
Unpaid principal balance with no allowance 1,927   1,986
Unpaid principal balance 2,125   2,197
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]      
Recorded investment with no allowance 115   115
Unpaid principal balance with no allowance 119   117
Related allowance with no allowance  
Average recorded investment with no allowance 115 171  
Interest income recognized with no allowance  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance  
Interest income recognized with allowance  
Recorded investment 115   115
Unpaid principal balance 119   117
Related allowance  
Average recorded investment 115 171  
Interest income recognized  
Unpaid principal balance with no allowance 119   117
Unpaid principal balance 119   117
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]      
Recorded investment with no allowance  
Unpaid principal balance with no allowance  
Related allowance with no allowance  
Average recorded investment with no allowance 523  
Interest income recognized with no allowance  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance  
Interest income recognized with allowance  
Recorded investment  
Unpaid principal balance  
Related allowance  
Average recorded investment 523  
Interest income recognized  
Unpaid principal balance with no allowance  
Unpaid principal balance  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Recorded investment with no allowance 447   353
Unpaid principal balance with no allowance 446   352
Related allowance with no allowance  
Average recorded investment with no allowance 400 253  
Interest income recognized with no allowance 9 2  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance 103  
Interest income recognized with allowance  
Recorded investment 447   353
Unpaid principal balance 446   352
Related allowance  
Average recorded investment 400 356  
Interest income recognized 9 2  
Unpaid principal balance with no allowance 446   352
Unpaid principal balance 446   352
Commercial Portfolio Segment [Member]      
Recorded investment with no allowance 247   249
Unpaid principal balance with no allowance 255   257
Related allowance with no allowance  
Average recorded investment with no allowance 248 398  
Interest income recognized with no allowance 2 3  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance 119  
Interest income recognized with allowance  
Recorded investment 247   249
Unpaid principal balance 255   257
Related allowance  
Average recorded investment 248 517  
Interest income recognized 2 3  
Unpaid principal balance with no allowance 255   257
Unpaid principal balance 255   257
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 56   56
Unpaid principal balance with no allowance 55   56
Related allowance with no allowance  
Average recorded investment with no allowance 56 30  
Interest income recognized with no allowance 1  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance 14  
Interest income recognized with allowance  
Recorded investment 56   56
Unpaid principal balance 55   56
Related allowance  
Average recorded investment 56 44  
Interest income recognized 1  
Unpaid principal balance with no allowance 55   56
Unpaid principal balance 55   56
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 42   48
Unpaid principal balance with no allowance 44   50
Related allowance with no allowance  
Average recorded investment with no allowance 45  
Interest income recognized with no allowance  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance  
Interest income recognized with allowance  
Recorded investment 42   48
Unpaid principal balance 44   50
Related allowance  
Average recorded investment 45  
Interest income recognized  
Unpaid principal balance with no allowance 44   50
Unpaid principal balance $ 44   $ 50