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Note 3 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Past Due $ 6,093 $ 6,258
Current 465,714 466,605
Loans 472,125 473,187
Financial Asset Acquired with Credit Deterioration [Member]    
Loans 318 324
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 3,486 4,406
Current 124,841 127,848
Loans 128,608 132,539
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 281 285
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 222 366
Current 18,751 18,948
Loans 18,973 19,314
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 51
Current 30,755 32,644
Loans 30,806 32,644
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 921 146
Current 128,498 121,628
Loans 129,456 121,813
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 37 39
Commercial Portfolio Segment [Member]    
Past Due 391 119
Current 44,537 45,330
Loans 44,928 45,449
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 559 651
Current 55,379 55,337
Loans 55,938 55,988
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 463 570
Current 62,953 64,870
Loans 63,416 65,440
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans
Financial Asset, 30 to 59 Days Past Due [Member]    
Past Due 3,779 3,717
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 2,050 2,572
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 130 185
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due 51
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 672
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 112 61
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 355 395
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Past Due 409 504
Financial Asset, 60 to 89 Days Past Due [Member]    
Past Due 1,131 1,393
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 401 824
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 6 101
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 249 146
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 218
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 204 256
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Past Due 53 66
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Past Due 1,183 1,148
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 1,035 1,010
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 86 80
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 61 58
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Past Due $ 1