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Note 5 - Loans and Allowance for Loan Losses (Details) - Recorded Investment in Loans by Risk Category - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans $ 363,942 $ 306,485
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 343,064 292,442
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 9,082 3,937
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 6,259 6,967
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 5,537 3,139
Unlikely to be Collected Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Residential Mortgage Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 148,575 107,096
Residential Mortgage Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 140,438 104,780
Residential Mortgage Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 3,657 105
Residential Mortgage Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,948 1,292
Residential Mortgage Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,532 919
Residential Mortgage Segment [Member] | Unlikely to be Collected Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Land Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 13,038 11,080
Land Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 10,077 7,969
Land Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 125 94
Land Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,812 3,001
Land Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 24 16
Land Segment [Member] | Unlikely to be Collected Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Residential Construction Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 12,616 8,463
Residential Construction Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 12,286 7,722
Residential Construction Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 330 741
Residential Construction Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Residential Construction Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Residential Construction Segment [Member] | Unlikely to be Collected Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 84,728 78,480
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 76,389 73,204
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 4,446 2,648
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,195 2,195
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,698 433
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 23,153 28,406
Commercial Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 22,365 26,137
Commercial Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 471 298
Commercial Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 150 329
Commercial Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 167 1,642
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Home Equity And Second Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 39,177 38,125
Home Equity And Second Mortgage [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 38,956 37,860
Home Equity And Second Mortgage [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 2
Home Equity And Second Mortgage [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 105 134
Home Equity And Second Mortgage [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 116 129
Home Equity And Second Mortgage [Member] | Unlikely to be Collected Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 42,655 34,835
Consumer Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 42,553 34,770
Consumer Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 53 49
Consumer Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 49 16
Consumer Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans $ 0 $ 0