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Note 3 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Loans $ 456,338   $ 437,231      
Less undisbursed portion of loans in process (24,812)   (25,020)      
Principal loan balance 431,526   412,211      
Deferred loan origination fees, net 1,076   1,041      
Allowance for loan losses (4,179) $ (3,867) (3,634) $ (3,537) $ (3,526) $ (3,386)
Loans, net 428,423   409,618      
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Loans 138,299   136,399      
Allowance for loan losses (755) (688) (219) (204) (212) (380)
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Loans 22,270   18,198      
Principal loan balance 22,270   18,198      
Deferred loan origination fees, net 14   17      
Allowance for loan losses (161) (148) (133) (126) (124) (56)
Real Estate Mortgage Portfolio Segment [Member] | Residential Construction [Member]            
Loans 30,228   28,854      
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]            
Loans 106,298   100,133      
Principal loan balance 106,298   100,133      
Deferred loan origination fees, net (41)   (42)      
Allowance for loan losses (1,317) (1,306) (1,622) (1,591) (1,583) (1,670)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Construction [Member]            
Loans 16,022   17,161      
Commercial Portfolio Segment [Member]            
Loans 33,773   34,114      
Principal loan balance 33,773   34,114      
Deferred loan origination fees, net 1   2      
Allowance for loan losses (470) (417) (291) (235) (290) (198)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Loans 52,139   49,802      
Principal loan balance 52,139   49,802      
Deferred loan origination fees, net 1,014   987      
Allowance for loan losses (691) $ (607) (710) $ (740) $ (680) $ (683)
Consumer Portfolio Segment [Member] | Automobile Loan [Member]            
Loans 42,154   38,361      
Consumer Portfolio Segment [Member] | Loans Secured by Deposits [Member]            
Loans 1,390   1,751      
Consumer Portfolio Segment [Member] | Unsecured Loan [Member]            
Loans 3,610   3,744      
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]            
Loans $ 10,155   $ 8,714