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Note 4 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($)
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Loan Gross $ 133,929,000   $ 147,933,000      
Allowance for loan losses (382,000) $ (408,000) (527,000) $ (584,000) $ (634,000) $ (609,000)
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Loan Gross 13,195,000   12,962,000      
Principal loan balance 13,195,000   12,962,000      
Net deferred loan origination fees and costs 13,000   6,000      
Allowance for loan losses (49,000) (47,000) (157,000) (161,000) (173,000) (201,000)
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]            
Loan Gross 26,972,000   16,391,000      
Principal loan balance 15,325,000   12,555,000      
Net deferred loan origination fees and costs 0   0      
Allowance for loan losses (63,000) (42,000) (47,000) (49,000) (51,000) (60,000)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]            
Loan Gross 93,798,000   84,493,000      
Principal loan balance 93,798,000   84,493,000      
Net deferred loan origination fees and costs (44,000)   (46,000)      
Allowance for loan losses (1,576,000) (1,473,000) (1,541,000) (1,613,000) (1,669,000) (1,501,000)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Construction [Member]            
Loan Gross 8,848,000   1,090,000      
Commercial Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Net deferred loan origination fees and costs 720,000          
Commercial Portfolio Segment [Member] | Other Consumer Loan [Member]            
Net deferred loan origination fees and costs 0          
Commercial Portfolio Segment [Member]            
Loan Gross 22,888,000   23,095,000      
Principal loan balance 22,888,000   23,095,000      
Net deferred loan origination fees and costs 1,000          
Allowance for loan losses (141,000) (162,000) (261,000) (185,000) (161,000) (1,480,000)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Loan Gross 42,093,000   38,476,000      
Principal loan balance 42,093,000   38,476,000      
Net deferred loan origination fees and costs     571,000      
Allowance for loan losses (826,000) (791,000) (626,000) (644,000) (648,000) (720,000)
Consumer Portfolio Segment [Member] | Automobile Loan [Member]            
Loan Gross 33,025,000   28,828,000      
Consumer Portfolio Segment [Member] | Loans Secured by Saving Accounts [Member]            
Loan Gross 1,819,000   2,096,000      
Consumer Portfolio Segment [Member] | Unsecured Loan [Member]            
Loan Gross 3,782,000   4,350,000      
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]            
Loan Gross 9,070,000   7,210,000      
Principal loan balance 47,696,000   42,484,000      
Net deferred loan origination fees and costs     0      
Allowance for loan losses (283,000) (266,000) (256,000) (258,000) (264,000) (275,000)
Consumer Portfolio Segment [Member]            
Net deferred loan origination fees and costs     (6,000)      
Loan Gross 389,419,000   366,924,000      
Less undisbursed portion of loans in process (20,495,000)   (4,926,000)      
Principal loan balance 368,924,000   361,998,000      
Net deferred loan origination fees and costs 763,000   583,000      
Allowance for loan losses (3,320,000) $ (3,189,000) (3,415,000) $ (3,494,000) $ (3,600,000) $ (4,846,000)
Loans, net $ 366,367,000   $ 359,166,000