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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Recorded investment with no allowance $ 3,361   $ 3,168
Unpaid principal balance with no allowance 3,604   3,563
Average recorded investment with no allowance 3,265 $ 3,470  
Interest income recognized with no allowance 16 11  
Recorded investment with allowance 319   255
Unpaid principal balance with allowance 328   261
Related allowance 117   52
Average recorded investment with allowance 287 240  
Interest income recognized with allowance  
Recorded investment 3,680   3,423
Unpaid principal balance 3,932   3,824
Average recorded investment 3,552 3,710  
Interest income recognized 16 11  
Related allowance 117   52
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Recorded investment with no allowance 2,525   2,695
Unpaid principal balance with no allowance 2,760   2,948
Average recorded investment with no allowance 2,610 2,010  
Interest income recognized with no allowance 7 8  
Recorded investment with allowance 278   212
Unpaid principal balance with allowance 285   218
Related allowance 101   35
Average recorded investment with allowance 245 150  
Interest income recognized with allowance  
Recorded investment 2,803   2,907
Unpaid principal balance 3,045   3,166
Average recorded investment 2,855 2,160  
Interest income recognized 7 8  
Related allowance 101   35
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]      
Recorded investment with no allowance 94  
Unpaid principal balance with no allowance 95  
Average recorded investment with no allowance 47  
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 94  
Unpaid principal balance 95  
Average recorded investment 47  
Interest income recognized  
Related allowance  
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]      
Recorded investment with no allowance  
Unpaid principal balance with no allowance  
Average recorded investment with no allowance  
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  
Average recorded investment  
Interest income recognized  
Related allowance  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Recorded investment with no allowance 365   401
Unpaid principal balance with no allowance 363   535
Average recorded investment with no allowance 383 1,150  
Interest income recognized with no allowance 5 3  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance  
Interest income recognized with allowance  
Recorded investment 365   401
Unpaid principal balance 363   535
Average recorded investment 383 1,150  
Interest income recognized 5 3  
Related allowance  
Commercial Portfolio Segment [Member]      
Recorded investment with no allowance 291   12
Unpaid principal balance with no allowance 292   12
Average recorded investment with no allowance 152 74  
Interest income recognized with no allowance 4  
Recorded investment with allowance 28   30
Unpaid principal balance with allowance 30   30
Related allowance 3   4
Average recorded investment with allowance 29 59  
Interest income recognized with allowance  
Recorded investment 319   42
Unpaid principal balance 322   42
Average recorded investment 181 133  
Interest income recognized 4  
Related allowance 3   4
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 78   60
Unpaid principal balance with no allowance 86   68
Average recorded investment with no allowance 69 230  
Interest income recognized with no allowance  
Recorded investment with allowance 13   13
Unpaid principal balance with allowance 13   13
Related allowance 13   13
Average recorded investment with allowance 13 13  
Interest income recognized with allowance  
Recorded investment 91   73
Unpaid principal balance 99   81
Average recorded investment 82 243  
Interest income recognized  
Related allowance 13   13
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]      
Recorded investment with no allowance 8  
Unpaid principal balance with no allowance 8  
Average recorded investment with no allowance 4 6  
Interest income recognized with no allowance  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance 18  
Interest income recognized with allowance  
Recorded investment 8  
Unpaid principal balance 8  
Average recorded investment 4 24  
Interest income recognized  
Related allowance