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Note 5 - Loans and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Residential Portfolio Segment [Member]          
Unpaid principal balance with no allowance $ 724,000   $ 724,000   $ 1,001,000
Recorded investment with no allowance 724,000   724,000   1,001,000
Average impaired loans with allowance   $ 1,005   $ 761  
Interest income recognized with allowance   11   36  
Cash basis interest recognized with allowance   11   36  
Average impaired loans with no allowance 725,000 895,000 728,000 895,000  
Interest income recognized with no allowance 4,000 20,000  
Cash basis interest recognized with no allowance 4 20  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]          
Unpaid principal balance with allowance 5,918,000   5,918,000   204,000
Recorded investment with allowance 5,918,000   5,918,000   204,000
Allowance for loan losses allocated 2,603,000   2,603,000   204,000
Unpaid principal balance with no allowance 3,291,000   3,291,000   3,812,000
Recorded investment with no allowance 2,744,000   2,744,000   3,265,000
Average impaired loans with allowance 5,427,000 204,000 2,815,000 204,000  
Interest income recognized with allowance 94,000 11,000 241,000 11,000  
Cash basis interest recognized with allowance 94,000 11,000 241,000 11,000  
Average impaired loans with no allowance 2,797,000 2,873,000 2,879,000 2,617,000  
Interest income recognized with no allowance 37,000 74,000 120,000 135,000  
Cash basis interest recognized with no allowance 37,000 74,000 120,000 135,000  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]          
Unpaid principal balance with allowance 387,000   387,000   396,000
Recorded investment with allowance 387,000   387,000   396,000
Allowance for loan losses allocated 102,000   102,000   107,000
Unpaid principal balance with no allowance 5,614,000   5,614,000   5,178,000
Recorded investment with no allowance 3,798,000   3,798,000   2,773,000
Average impaired loans with allowance 389,000 401,000 392,000 404,000  
Interest income recognized with allowance 5,000 5,000 15,000 70,000  
Cash basis interest recognized with allowance 5,000 5,000 15,000 70,000  
Average impaired loans with no allowance 3,680,000 2,910,000 3,557,000 3,605,000  
Interest income recognized with no allowance 33,000 12,000 75,000 37,000  
Cash basis interest recognized with no allowance 33,000 12,000 75,000 37,000  
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]          
Unpaid principal balance with no allowance 641,000   641,000   680,000
Recorded investment with no allowance 544,000   544,000   680,000
Average impaired loans with no allowance 363,000 680,000 521,000 510,000  
Interest income recognized with no allowance 11,000 108,000  
Cash basis interest recognized with no allowance 11,000 108,000  
Commercial and Industrial Portfolio Segment [Member]          
Unpaid principal balance with allowance 391,000   391,000   4,355,000
Recorded investment with allowance 391,000   391,000   4,355,000
Allowance for loan losses allocated 245,000   245,000   1,850,000
Unpaid principal balance with no allowance 8,708,000   8,708,000   4,336,000
Recorded investment with no allowance 8,708,000   8,708,000   4,336,000
Average impaired loans with allowance 391,000 3,589,000 391,000 3,343,000  
Interest income recognized with allowance 52,000 117,000  
Cash basis interest recognized with allowance 52,000 117,000  
Average impaired loans with no allowance 8,575,000 3,800,000 8,234,000 3,897,000  
Interest income recognized with no allowance 103,000 26,000 290,000 133,000  
Cash basis interest recognized with no allowance 103,000 26,000 290,000 133,000  
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]          
Unpaid principal balance with allowance 216,000   216,000   218,000
Recorded investment with allowance 216,000   216,000   218,000
Allowance for loan losses allocated 2,000   2,000   3,000
Average impaired loans with allowance 217,000 218,000 218,000 219,000  
Interest income recognized with allowance 1,000 2,000 5,000 6,000  
Cash basis interest recognized with allowance 1,000 2,000 5,000 6,000  
Allowance for loan losses allocated 2,952,000   2,952,000   2,164,000
Unpaid principal balance 25,890,000   25,890,000   20,180,000
Recorded investment 23,430,000   23,430,000   $ 17,228,000
Average impaired loans 22,564,000 16,575,000 19,735,000 16,455,000  
Interest income recognized 288,000 193,000 874,000 545,000  
Cash basis interest recognized $ 288,000 $ 193,000 $ 874,000 $ 545,000