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Note 3 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Loans $ 587,134   $ 514,766      
Less undisbursed portion of loans in process (40,175)   (26,520)      
Principal loan balance 546,959   488,246      
Deferred loan origination fees and costs, net 1,200   1,124      
Allowance for loan losses (6,566) $ (6,394) (6,083) $ (6,567) $ (6,637) $ (6,625)
Loans, net 541,593   483,287      
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Loans 153,659   130,603      
Allowance for loan losses (1,352) (1,265) (1,174) (1,211) (1,216) (1,239)
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Loans 22,377   19,478      
Principal loan balance 22,377   19,478      
Deferred loan origination fees and costs, net 14   13      
Allowance for loan losses (273) (241) (234) (205) (215) (209)
Real Estate Mortgage Portfolio Segment [Member] | Residential Construction [Member]            
Loans 72,371   59,959      
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Construction [Member]            
Loans 161,296   137,915      
Commercial Portfolio Segment [Member]            
Loans 54,760   51,787      
Principal loan balance 54,760   51,787      
Deferred loan origination fees and costs, net (12)   (46)      
Allowance for loan losses (886) (888) (873) (764) (784) (843)
Consumer Portfolio Segment [Member]            
Allowance for loan losses (1,019) (980) (988)      
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Loans 58,596   54,453      
Principal loan balance 58,596   54,453      
Deferred loan origination fees and costs, net 1,192   1,129      
Allowance for loan losses (536) $ (533) (527) $ (645) $ (625) $ (617)
Consumer Portfolio Segment [Member] | Automobile Loan [Member]            
Loans 48,100   43,946      
Consumer Portfolio Segment [Member] | Loans Secured by Deposits [Member]            
Loans 655   827      
Consumer Portfolio Segment [Member] | Unsecured Loan [Member]            
Loans 2,230   2,219      
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]            
Loans 13,090   13,579      
Principal loan balance 64,075   60,571      
Deferred loan origination fees and costs, net $ 0   $ 0