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Note 5 - Loans and Allowance for Loan Losses - Recorded Investment in Loans by Risk Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Loans $ 414,617 $ 385,764
Pass [Member]    
Loans 405,806 372,497
Special Mention [Member]    
Loans 3,623 3,087
Substandard [Member]    
Loans 2,640 6,863
Doubtful [Member]    
Loans 2,548 3,317
Unlikely to be Collected Financing Receivable [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 136,960 138,377
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Pass [Member]    
Loans 133,618 135,328
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Special Mention [Member]    
Loans 348 403
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Substandard [Member]    
Loans 684 721
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Doubtful [Member]    
Loans 2,310 1,925
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Loans 18,309 13,951
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Pass [Member]    
Loans 18,003 13,795
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Special Mention [Member]    
Loans 157 86
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Substandard [Member]    
Loans 149 70
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Doubtful [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Loans 21,034 19,489
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]    
Loans 20,173 19,489
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]    
Loans 861
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Loans 100,340 96,669
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Pass [Member]    
Loans 97,219 87,782
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Special Mention [Member]    
Loans 1,362 1,892
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Substandard [Member]    
Loans 1,620 5,991
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Doubtful [Member]    
Loans 139 1,004
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans
Commercial Portfolio Segment [Member]    
Loans 34,203 24,126
Commercial Portfolio Segment [Member] | Pass [Member]    
Loans 33,245 23,246
Commercial Portfolio Segment [Member] | Special Mention [Member]    
Loans 734 661
Commercial Portfolio Segment [Member] | Substandard [Member]    
Loans 182 77
Commercial Portfolio Segment [Member] | Doubtful [Member]    
Loans 42 142
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans 50,978 43,831
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Pass [Member]    
Loans 50,919 43,601
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Special Mention [Member]    
Loans
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Substandard [Member]    
Loans 2 4
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Doubtful [Member]    
Loans 57 226
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Loans 52,793 49,321
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Pass [Member]    
Loans 52,629 49,256
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Special Mention [Member]    
Loans 161 45
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Substandard [Member]    
Loans 3
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Doubtful [Member]    
Loans 20
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans