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Note 3 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Past Due $ 5,271 $ 6,194
Current 406,547 408,025
Loans 412,218 414,617
Financial Asset Acquired with Credit Deterioration [Member]    
Loans 400 398
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 3,736 4,205
Current 130,794 132,405
Loans 134,883 136,960
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 353 350
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 475 281
Current 20,861 18,028
Loans 21,336 18,309
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due
Current 25,354 21,034
Loans 25,354 21,034
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 337 518
Current 95,267 99,774
Loans 95,651 100,340
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 47 48
Commercial Portfolio Segment [Member]    
Past Due 280 197
Current 33,005 34,006
Loans 33,285 34,203
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 166 508
Current 50,422 50,470
Loans 50,588 50,978
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 277 485
Current 50,844 52,308
Loans 51,121 52,793
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans
Financing Receivables, 30 to 59 Days Past Due [Member]    
Past Due 3,046 4,111
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 2,108 2,612
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 381 186
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 379
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 156 46
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 152 468
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 249 420
Financing Receivables, 60 to 89 Days Past Due [Member]    
Past Due 404 451
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 155 338
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 233
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 49
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 1 27
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 15 37
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Past Due 1,821 1,632
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 1,473 1,255
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 94 95
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 104 139
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 124 102
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 13 13
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due $ 13 $ 28