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Note 3 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Loans $ 517,633   $ 525,818      
Less undisbursed portion of loans in process (26,473)   (19,179)      
Principal loan balance 491,160   506,639      
Deferred loan origination fees and costs, net 912   317      
Allowance for loan losses (6,567) $ (6,637) (6,625) $ (6,404) $ (6,064) $ (5,061)
Loans, net 485,505   500,331      
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Loans 132,226   131,217      
Allowance for loan losses (1,211) (1,216) (1,239) (1,129) (1,055) (867)
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Loans 18,187   17,328      
Principal loan balance 18,187   17,328      
Deferred loan origination fees and costs, net 16   17      
Allowance for loan losses (205) (215) (209) (207) (196) (163)
Real Estate Mortgage Portfolio Segment [Member] | Residential Construction [Member]            
Loans 50,197   39,160      
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]            
Loans 133,480   135,114      
Principal loan balance 133,480   135,114      
Deferred loan origination fees and costs, net (59)   (65)      
Allowance for loan losses (2,317) (2,357) (2,358) (2,054) (1,902) (1,623)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Construction [Member]            
Loans 9,592   4,988      
Commercial Portfolio Segment [Member]            
Loans 60,143   82,274      
Principal loan balance 60,143   82,274      
Deferred loan origination fees and costs, net (269)   (843)      
Allowance for loan losses (764) (784) (843) (853) (868) (595)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Loans 52,456   52,001      
Principal loan balance 52,456   52,001      
Deferred loan origination fees and costs, net 1,127   1,100      
Allowance for loan losses (645) (625) (617) (643) (604) (515)
Consumer Portfolio Segment [Member] | Automobile Loan [Member]            
Loans 44,277   43,770      
Consumer Portfolio Segment [Member] | Loans Secured by Deposits [Member]            
Loans 1,007   1,083      
Consumer Portfolio Segment [Member] | Unsecured Loan [Member]            
Loans 2,241   2,766      
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]            
Loans 13,827   16,117      
Principal loan balance 61,352   63,736      
Deferred loan origination fees and costs, net 0   0      
Allowance for loan losses $ (1,022) $ (1,051) $ (1,067) $ (1,145) $ (1,070) $ (948)