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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]          
Recorded investment with no allowance $ 1,914   $ 1,914   $ 1,938,000
Unpaid principal balance with no allowance 2,260   2,260   2,330,000
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 1,903 $ 1,177,000 1,912 $ 1,211,000  
Interest income recognized with no allowance 6 5,000 20 14,000  
Recorded investment with allowance 120   120   58,000
Unpaid principal balance with allowance 123   123   62,000
Related allowance with allowance 15   15   6,000
Average recorded investment with allowance 157 205,000 132 223,000  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 2,034   2,034   1,996,000
Unpaid principle balance 2,383   2,383   2,392,000
Average recorded investment 2,060 1,382,000 2,044 1,434,000  
Interest income recognized 6 5,000 20 14,000  
Average recorded investment with no related allowance 1,903 1,177,000 1,912 1,211,000  
Interest income recognized with no allowance 6 5,000 20 14,000  
Average recorded investment with allowance 157 205,000 132 223,000  
Interest income recognized with allowance 0 0 0 0  
Average recorded investment 2,060 1,382,000 2,044 1,434,000  
Interest income recognized 6 5,000 20 14,000  
Recorded investment with no allowance 1,914   1,914   1,938,000
Unpaid principal balance with no allowance 2,260   2,260   2,330,000
Recorded investment with allowance 120   120   58,000
Unpaid principal balance with allowance 123   123   62,000
Related allowance with allowance 15   15   6,000
Recorded investment 2,034   2,034   1,996,000
Unpaid principal balance 2,383   2,383   2,392,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]          
Recorded investment with no allowance 0   0   24,000
Unpaid principal balance with no allowance 0   0   27,000
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 0 21,000 6 19,000  
Interest income recognized with no allowance 0 0 0 0  
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance with allowance 0   0   0
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 0   0   24,000
Unpaid principle balance 0   0   27,000
Average recorded investment 0 21,000 6 19,000  
Interest income recognized 0 0 0 0  
Average recorded investment with no related allowance 0 21,000 6 19,000  
Interest income recognized with no allowance 0 0 0 0  
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Average recorded investment 0 21,000 6 19,000  
Interest income recognized 0 0 0 0  
Recorded investment with no allowance 0   0   24,000
Unpaid principal balance with no allowance 0   0   27,000
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance with allowance 0   0   0
Recorded investment 0   0   24,000
Unpaid principal balance 0   0   27,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]          
Recorded investment with no allowance 0   0   0
Unpaid principal balance with no allowance 0   0   0
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 0 0 0 0  
Interest income recognized with no allowance 3 0 3 0  
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance with allowance 0   0   0
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 0   0   0
Unpaid principle balance 0   0   0
Average recorded investment 0 0 0 0  
Interest income recognized 3 0 3 0  
Average recorded investment with no related allowance 0 0 0 0  
Interest income recognized with no allowance 3 0 3 0  
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Average recorded investment 0 0 0 0  
Interest income recognized 3 0 3 0  
Recorded investment with no allowance 0   0   0
Unpaid principal balance with no allowance 0   0   0
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance with allowance 0   0   0
Recorded investment 0   0   0
Unpaid principal balance 0   0   0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]          
Recorded investment with no allowance 2,983   2,983   3,389,000
Unpaid principal balance with no allowance 3,412   3,412   3,706,000
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 3,396 1,755,000 3,394 1,768,000  
Interest income recognized with no allowance 18 19,000 55 57,000  
Recorded investment with allowance 0   0   234,000
Unpaid principal balance with allowance 0   0   260,000
Related allowance with allowance 0   0   49,000
Average recorded investment with allowance 87 38,000 124 39,000  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 2,983   2,983   3,623,000
Unpaid principle balance 3,412   3,412   3,966,000
Average recorded investment 3,483 1,793,000 3,518 1,807,000  
Interest income recognized 18 19,000 55 57,000  
Average recorded investment with no related allowance 3,396 1,755,000 3,394 1,768,000  
Interest income recognized with no allowance 18 19,000 55 57,000  
Average recorded investment with allowance 87 38,000 124 39,000  
Interest income recognized with allowance 0 0 0 0  
Average recorded investment 3,483 1,793,000 3,518 1,807,000  
Interest income recognized 18 19,000 55 57,000  
Recorded investment with no allowance 2,983   2,983   3,389,000
Unpaid principal balance with no allowance 3,412   3,412   3,706,000
Recorded investment with allowance 0   0   234,000
Unpaid principal balance with allowance 0   0   260,000
Related allowance with allowance 0   0   49,000
Recorded investment 2,983   2,983   3,623,000
Unpaid principal balance 3,412   3,412   3,966,000
Commercial Portfolio Segment [Member]          
Recorded investment with no allowance 61   61   67,000
Unpaid principal balance with no allowance 66   66   67,000
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 62 0 64 7,000  
Interest income recognized with no allowance 0 1,000 0 1,000  
Recorded investment with allowance 0   0   100,000
Unpaid principal balance with allowance 0   0   100,000
Related allowance with allowance 0   0   100,000
Average recorded investment with allowance 33 0 50 419,000  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 61   61   167,000
Unpaid principle balance 66   66   167,000
Average recorded investment 95 0 114 426,000  
Interest income recognized 0 1,000 0 1,000  
Average recorded investment with no related allowance 62 0 64 7,000  
Interest income recognized with no allowance 0 1,000 0 1,000  
Average recorded investment with allowance 33 0 50 419,000  
Interest income recognized with allowance 0 0 0 0  
Average recorded investment 95 0 114 426,000  
Interest income recognized 0 1,000 0 1,000  
Recorded investment with no allowance 61   61   67,000
Unpaid principal balance with no allowance 66   66   67,000
Recorded investment with allowance 0   0   100,000
Unpaid principal balance with allowance 0   0   100,000
Related allowance with allowance 0   0   100,000
Recorded investment 61   61   167,000
Unpaid principal balance 66   66   167,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Recorded investment with no allowance 49   49   56,000
Unpaid principal balance with no allowance 55   55   65,000
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 52 62,000 53 66,000  
Interest income recognized with no allowance 0 1,000 1 1,000  
Recorded investment with allowance 13   13   80,000
Unpaid principal balance with allowance 14   14   81,000
Related allowance with allowance 13   13   11,000
Average recorded investment with allowance 13 80,000 30 80,000  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 62   62   136,000
Unpaid principle balance 69   69   146,000
Average recorded investment 65 142,000 83 146,000  
Interest income recognized 0 1,000 1 1,000  
Average recorded investment with no related allowance 52 62,000 53 66,000  
Interest income recognized with no allowance 0 1,000 1 1,000  
Average recorded investment with allowance 13 80,000 30 80,000  
Interest income recognized with allowance 0 0 0 0  
Average recorded investment 65 142,000 83 146,000  
Interest income recognized 0 1,000 1 1,000  
Recorded investment with no allowance 49   49   56,000
Unpaid principal balance with no allowance 55   55   65,000
Recorded investment with allowance 13   13   80,000
Unpaid principal balance with allowance 14   14   81,000
Related allowance with allowance 13   13   11,000
Recorded investment 62   62   136,000
Unpaid principal balance 69   69   146,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]          
Recorded investment with no allowance 10   10   0
Unpaid principal balance with no allowance 28   28   0
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 7 0 5 0  
Interest income recognized with no allowance 0 0 0 0  
Recorded investment with allowance 20   20   0
Unpaid principal balance with allowance 20   20   0
Related allowance with allowance 6   6   0
Average recorded investment with allowance 29 0 22 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 30   30   0
Unpaid principle balance 48   48   0
Average recorded investment 36 0 27 0  
Interest income recognized 0 0 0 0  
Average recorded investment with no related allowance 7 0 5 0  
Interest income recognized with no allowance 0 0 0 0  
Average recorded investment with allowance 29 0 22 0  
Interest income recognized with allowance 0 0 0 0  
Average recorded investment 36 0 27 0  
Interest income recognized 0 0 0 0  
Recorded investment with no allowance 10   10   0
Unpaid principal balance with no allowance 28   28   0
Recorded investment with allowance 20   20   0
Unpaid principal balance with allowance 20   20   0
Related allowance with allowance 6   6   0
Recorded investment 30   30   0
Unpaid principal balance 48   48   0
Recorded investment with no allowance 5,017   5,017   5,474,000
Unpaid principal balance with no allowance 5,821   5,821   6,195,000
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 5,420 3,015,000 5,434 3,071,000  
Interest income recognized with no allowance 27 26,000 79 73,000  
Recorded investment with allowance 153   153   472,000
Unpaid principal balance with allowance 157   157   503,000
Related allowance with allowance 34   34   166,000
Average recorded investment with allowance 319 323,000 358 761,000  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 5,170   5,170   5,946,000
Unpaid principle balance 5,978   5,978   6,698,000
Average recorded investment 5,739 3,338,000 5,792 3,832,000  
Interest income recognized 27 26,000 79 73,000  
Average recorded investment with no related allowance 5,420 3,015,000 5,434 3,071,000  
Interest income recognized with no allowance 27 26,000 79 73,000  
Average recorded investment with allowance 319 323,000 358 761,000  
Interest income recognized with allowance 0 0 0 0  
Average recorded investment 5,739 3,338,000 5,792 3,832,000  
Interest income recognized 27 $ 26,000 79 $ 73,000  
Recorded investment with no allowance 5,017   5,017   5,474,000
Unpaid principal balance with no allowance 5,821   5,821   6,195,000
Recorded investment with allowance 153   153   472,000
Unpaid principal balance with allowance 157   157   503,000
Related allowance with allowance 34   34   166,000
Recorded investment 5,170   5,170   5,946,000
Unpaid principal balance $ 5,978   $ 5,978   $ 6,698,000