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Note 3 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Loans $ 415,137   $ 402,740      
Less undisbursed portion of loans in process (18,125)   (19,037)      
Principal loan balance 397,012   383,703      
Deferred loan origination fees, net 966   837      
Allowance for loan losses (3,526) $ (3,418) (3,386) $ (3,189) $ (3,319) $ (3,415)
Loans, net 394,452   381,154      
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Loans 134,773   137,842      
Principal loan balance 134,773   137,842      
Deferred loan origination fees, net 85   80      
Allowance for loan losses (212) (271) (380) (408) (470) (527)
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Loans 17,870   13,895      
Principal loan balance 17,870   13,895      
Deferred loan origination fees, net 17   14      
Allowance for loan losses (124) (109) (56) (47) (84) (157)
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]            
Loans 33,736   29,561      
Principal loan balance 25,078   19,445      
Deferred loan origination fees, net (4)   0      
Allowance for loan losses (306) (223) (80) (42) (45) (47)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]            
Loans 93,638   96,462      
Principal loan balance 93,638   96,462      
Deferred loan origination fees, net (33)   (42)      
Allowance for loan losses (1,583) (1,585) (1,670) (1,473) (1,468) (1,541)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Construction [Member]            
Loans 9,467   8,921      
Commercial Portfolio Segment [Member]            
Loans 28,092   24,056      
Principal loan balance 28,092   24,056      
Deferred loan origination fees, net 3   3      
Allowance for loan losses (290) (244) (198) (162) (273) (261)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Loans 46,089   42,908      
Principal loan balance 46,089   42,908      
Deferred loan origination fees, net 898   782      
Allowance for loan losses (680) (698) (683) (791) (721) (626)
Consumer Portfolio Segment [Member] | Automobile Loan [Member]            
Loans 36,287   34,279      
Consumer Portfolio Segment [Member] | Loans Secured by Saving Accounts [Member]            
Loans 1,944   1,879      
Consumer Portfolio Segment [Member] | Unsecured Loan [Member]            
Loans 3,747   3,912      
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]            
Loans 9,494   9,025      
Principal loan balance 51,472   49,095      
Deferred loan origination fees, net 0   0      
Allowance for loan losses $ (331) $ (288) $ (319) $ (266) $ (258) $ (256)