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Note 3 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Loans $ 519,602   $ 493,499      
Less undisbursed portion of loans in process (20,937)   (23,081)      
Principal loan balance 498,665   470,418      
Deferred loan origination fees and costs, net (133)   1,137      
Allowance for loan losses (6,404) $ (6,064) (5,061) $ (4,739) $ (4,609) $ (4,065)
Loans, net 492,128   466,494      
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Loans 127,146   131,959      
Allowance for loan losses (1,129) (1,055) (867) (806) (754) (693)
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Loans 17,181   19,185      
Principal loan balance 17,181   19,185      
Deferred loan origination fees and costs, net 14   15      
Allowance for loan losses (207) (196) (163) (172) (170) (162)
Real Estate Mortgage Portfolio Segment [Member] | Residential Construction [Member]            
Loans 44,091   35,554      
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]            
Loans 128,130   121,563      
Principal loan balance 128,130   121,563      
Deferred loan origination fees and costs, net (64)   (62)      
Allowance for loan losses (2,054) (1,902) (1,623) (1,482) (1,452) (1,401)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Construction [Member]            
Loans 6,539   20,086      
Commercial Portfolio Segment [Member]            
Loans 79,856   45,307      
Principal loan balance 79,856   45,307      
Deferred loan origination fees and costs, net (1,275)   0      
Allowance for loan losses (853) (868) (595) (552) (596) (459)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Loans 51,885   54,677      
Principal loan balance 51,885   54,677      
Deferred loan origination fees and costs, net 1,085   1,067      
Allowance for loan losses (643) (604) (515) (487) (472) (443)
Consumer Portfolio Segment [Member] | Automobile Loan [Member]            
Loans 44,304   46,443      
Consumer Portfolio Segment [Member] | Loans Secured by Deposits [Member]            
Loans 1,204   1,372      
Consumer Portfolio Segment [Member] | Unsecured Loan [Member]            
Loans 2,912   3,653      
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]            
Loans 16,354   13,700      
Allowance for loan losses $ (1,145) $ (1,070) $ (948) $ (889) $ (849) $ (683)