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Note 3 - Loans and Allowance for Loan Losses - Recorded Investment in Loans by Risk Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Loans $ 412,218 $ 414,617
Pass [Member]    
Loans 403,797 405,806
Special Mention [Member]    
Loans 2,992 3,623
Substandard [Member]    
Loans 2,739 2,640
Doubtful [Member]    
Loans 2,690 2,548
Unlikely to be Collected Financing Receivable [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 134,883 136,960
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Pass [Member]    
Loans 131,433 133,618
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Special Mention [Member]    
Loans 395 348
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Substandard [Member]    
Loans 778 684
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Doubtful [Member]    
Loans 2,277 2,310
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 21,336 18,309
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Pass [Member]    
Loans 21,109 18,003
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Special Mention [Member]    
Loans 83 157
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Substandard [Member]    
Loans 50 149
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Doubtful [Member]    
Loans 94
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 25,354 21,034
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]    
Loans 25,125 20,173
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]    
Loans 229 861
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 95,651 100,340
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Pass [Member]    
Loans 92,367 97,219
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Special Mention [Member]    
Loans 1,347 1,362
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Substandard [Member]    
Loans 1,833 1,620
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Doubtful [Member]    
Loans 104 139
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans
Commercial Portfolio Segment [Member]    
Loans 33,285 34,203
Commercial Portfolio Segment [Member] | Pass [Member]    
Loans 32,287 33,245
Commercial Portfolio Segment [Member] | Special Mention [Member]    
Loans 786 734
Commercial Portfolio Segment [Member] | Substandard [Member]    
Loans 73 182
Commercial Portfolio Segment [Member] | Doubtful [Member]    
Loans 139 42
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans 50,588 50,978
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Pass [Member]    
Loans 50,510 50,919
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 2
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Doubtful [Member]    
Loans 76 57
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 51,121 52,793
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Pass [Member]    
Loans 50,966 52,629
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Special Mention [Member]    
Loans 152 161
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Substandard [Member]    
Loans 3 3
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Doubtful [Member]    
Loans
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Loans