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Note 3 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Past Due $ 4,968 $ 5,282
Current 393,628 379,852
Loans 399,152 385,764
Receivables Acquired with Deteriorated Credit Quality [Member]    
Loans 556 630
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 4,360 4,172
Current 130,497 133,815
Loans 135,240 138,377
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Loans 383 390
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 51 52
Current 17,892 13,899
Loans 17,943 13,951
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due 0 0
Current 25,135 19,489
Loans 25,135 19,489
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 30 27
Current 93,640 96,402
Loans 93,843 96,669
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Loans 173 240
Commercial Portfolio Segment [Member]    
Past Due 110 238
Current 28,060 23,888
Loans 28,170 24,126
Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Loans 0 0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 210 365
Current 46,929 43,466
Loans 47,139 43,831
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Loans 0 0
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 207 428
Current 51,475 48,893
Loans 51,682 49,321
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Loans 0 0
Financing Receivables, 30 to 59 Days Past Due [Member]    
Past Due 2,416 3,270
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 2,225 2,444
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 0 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due 0 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 0 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 45 155
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 3 352
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 143 319
Financing Receivables, 60 to 89 Days Past Due [Member]    
Past Due 723 825
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 624 707
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 51 52
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 28 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 20 66
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Past Due 1,829 1,187
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 1,511 1,021
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 30 27
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 65 83
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 179 13
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due $ 44 $ 43