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Note 3 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Past Due $ 6,283 $ 6,194
Current 427,487 408,025
Loans 434,100 414,617
Financial Asset Acquired with Credit Deterioration [Member]    
Loans 330 398
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 4,171 4,205
Current 134,437 132,405
Loans 138,890 136,960
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 282 350
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 376 281
Current 22,034 18,028
Loans 22,410 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 21,480 21,034
Loans 21,480 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 621 518
Current 105,839 99,774
Loans 106,508 100,340
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 48 48
Commercial Portfolio Segment [Member]    
Past Due 622 197
Current 33,265 34,006
Loans 33,887 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 243 508
Current 53,138 50,470
Loans 53,381 50,978
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Past Due 250 485
Current 57,294 52,308
Loans 57,544 52,793
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans
Financing Receivables, 30 to 59 Days Past Due [Member]    
Past Due 3,754 4,111
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 1,879 2,612
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 241 186
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 621 379
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 622 46
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 208 468
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Past Due 183 420
Financing Receivables, 60 to 89 Days Past Due [Member]    
Past Due 1,000 451
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 902 338
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 39
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
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 27
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Past Due 59 37
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Past Due 1,529 1,632
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 1,390 1,255
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 96 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 139
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 102
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 35 13
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Past Due $ 8 $ 28