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Note 3 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Loans $ 420,609   $ 402,740      
Less undisbursed portion of loans in process (17,333)   (19,037)      
Principal loan balance 403,276   383,703      
Deferred loan origination fees, net 1,023   837      
Allowance for loan losses (3,537) $ (3,526) (3,386) $ (3,320) $ (3,189) $ (3,415)
Loans, net 400,762   381,154      
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Loans 136,273   137,842      
Principal loan balance 136,273   137,842      
Deferred loan origination fees, net 86   80      
Allowance for loan losses (204) (212) (380) (382) (408) (527)
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Loans 17,638   13,895      
Principal loan balance 17,638   13,895      
Deferred loan origination fees, net 16   14      
Allowance for loan losses (126) (124) (56) (49) (47) (157)
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]            
Loans 33,263   29,561      
Principal loan balance 22,974   19,445      
Deferred loan origination fees, net (3)   0      
Allowance for loan losses (261) (306) (80) (63) (42) (47)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]            
Loans 95,339   96,462      
Principal loan balance 95,339   96,462      
Deferred loan origination fees, net (33)   (42)      
Allowance for loan losses (1,591) (1,583) (1,670) (1,576) (1,473) (1,541)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Construction [Member]            
Loans 7,044   8,921      
Commercial Portfolio Segment [Member]            
Loans 28,525   24,056      
Principal loan balance 28,525   24,056      
Deferred loan origination fees, net 3   3      
Allowance for loan losses (235) (290) (198) (141) (162) (261)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Loans 48,951   42,908      
Principal loan balance 48,951   42,908      
Deferred loan origination fees, net 954   782      
Allowance for loan losses (740) (680) (683) (826) (791) (626)
Consumer Portfolio Segment [Member] | Automobile Loan [Member]            
Loans 38,033   34,279      
Consumer Portfolio Segment [Member] | Loans Secured by Saving Accounts [Member]            
Loans 1,916   1,879      
Consumer Portfolio Segment [Member] | Unsecured Loan [Member]            
Loans 3,747   3,912      
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]            
Loans 9,880   9,025      
Principal loan balance 53,576   49,095      
Deferred loan origination fees, net 0   0      
Allowance for loan losses $ (380) $ (331) $ (319) $ (283) $ (266) $ (256)