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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Recorded investment with no allowance $ 3,533 $ 3,168  
Unpaid principal balance with no allowance 3,838 3,563  
Average recorded investment with no allowance 3,198 3,378 $ 5,026
Interest income recognized with no allowance 55 48 92
Related allowance with no allowance  
Recorded investment with allowance 252 255  
Unpaid principal balance with allowance 258 261  
Related allowance 48 52  
Average recorded investment with allowance 288 214 350
Interest income recognized with allowance
Recorded investment 3,785 3,423  
Unpaid principle balance 4,096 3,824  
Average recorded investment 3,486 3,592 5,376
Interest income recognized 55 48 92
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Recorded investment with no allowance 2,170 2,695  
Unpaid principal balance with no allowance 2,409 2,948  
Average recorded investment with no allowance 2,335 2,437 1,904
Interest income recognized with no allowance 23 28 26
Recorded investment with allowance 14 212  
Unpaid principal balance with allowance 15 218  
Related allowance 3 35  
Average recorded investment with allowance 203 140 148
Interest income recognized with allowance
Recorded investment 2,184 2,907  
Unpaid principle balance 2,424 3,166  
Average recorded investment 2,538 2,577 2,052
Interest income recognized 23 28 26
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]      
Recorded investment with no allowance 152  
Unpaid principal balance with no allowance 153  
Average recorded investment with no allowance 135 5
Interest income recognized with no allowance 2
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance
Interest income recognized with allowance
Recorded investment 152  
Unpaid principle balance 153  
Average recorded investment 135 5
Interest income recognized 2
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]      
Recorded investment with no allowance 521  
Unpaid principal balance with no allowance 521  
Average recorded investment with no allowance 104
Interest income recognized with no allowance 3
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance
Interest income recognized with allowance
Recorded investment 521  
Unpaid principle balance 521  
Average recorded investment 104
Interest income recognized 3
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Recorded investment with no allowance 255 401  
Unpaid principal balance with no allowance 260 535  
Average recorded investment with no allowance 325 686 2,959
Interest income recognized with no allowance 16 16 60
Recorded investment with allowance 211  
Unpaid principal balance with allowance 213  
Related allowance 44  
Average recorded investment with allowance 42 99
Interest income recognized with allowance
Recorded investment 466 401  
Unpaid principle balance 473 535  
Average recorded investment 367 686 3,058
Interest income recognized 16 16 60
Commercial Portfolio Segment [Member]      
Recorded investment with no allowance 400 12  
Unpaid principal balance with no allowance 451 12  
Average recorded investment with no allowance 237 57 66
Interest income recognized with no allowance 14 1
Recorded investment with allowance 27 30  
Unpaid principal balance with allowance 30 30  
Related allowance 1 4  
Average recorded investment with allowance 38 40 54
Interest income recognized with allowance
Recorded investment 427 42  
Unpaid principle balance 481 42  
Average recorded investment 275 97 120
Interest income recognized 14 1
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 35 60  
Unpaid principal balance with no allowance 44 68  
Average recorded investment with no allowance 57 194 88
Interest income recognized with no allowance 1 1 2
Recorded investment with allowance 13  
Unpaid principal balance with allowance 13  
Related allowance 13  
Average recorded investment with allowance 5 20 27
Interest income recognized with allowance
Recorded investment 35 73  
Unpaid principle balance 44 81  
Average recorded investment 62 214 115
Interest income recognized 1 1 2
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]      
Recorded investment with no allowance  
Unpaid principal balance with no allowance  
Average recorded investment with no allowance 5 4 4
Interest income recognized with no allowance 1 1
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance 14 22
Interest income recognized with allowance
Recorded investment  
Unpaid principle balance  
Average recorded investment 5 18 26
Interest income recognized $ 1 $ 1