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Note 3 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Loans $ 493,597 $ 508,879
Financial Asset Acquired with Credit Deterioration [Member]    
Loans 288 297
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 132,774 131,850
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 271 271
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Loans 18,306 17,461
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Loans 33,369 25,018
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Loans 133,721 135,484
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 17 26
Commercial Portfolio Segment [Member]    
Loans 60,131 81,809
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 0 0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans 53,736 53,277
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 0 0
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Loans 61,560 63,980
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Loans 0 0
Financial Asset, 30 to 59 Days Past Due [Member]    
Loans 2,265 2,295
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 1,641 1,672
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Loans 111 130
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Loans 0 0
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Loans 0 155
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Loans 285 0
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans 26 53
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Loans 202 285
Financial Asset, 60 to 89 Days Past Due [Member]    
Loans 259 695
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 144 227
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Loans 0 65
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Loans 81 0
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Loans 0 0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Loans 0 0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans 0 302
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Loans 34 101
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loans 864 882
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 460 726
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Loans 100 156
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Loans 0 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Loans 0 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Loans 0 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans 304 0
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]    
Loans 0 0
Financial Asset, Past Due [Member]    
Loans 3,388 3,872
Financial Asset, Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 2,245 2,625
Financial Asset, Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Loans 211 351
Financial Asset, Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Loans 81 0
Financial Asset, Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Loans 0 155
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]    
Loans 285 0
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans 330 355
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Loans 236 386
Financial Asset, Not Past Due [Member]    
Loans 489,921 504,710
Financial Asset, Not Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 130,258 128,954
Financial Asset, Not Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Loans 18,095 17,110
Financial Asset, Not Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Loans 33,288 25,018
Financial Asset, Not Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Loans 133,704 135,303
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]    
Loans 59,846 81,809
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans 53,406 52,922
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Loans $ 61,324 $ 63,594