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Note 4 - Loans (Details) - USD ($)
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Loan Gross $ 138,445,000   $ 147,933,000      
Allowance for loan losses (408,000) $ (470,000) (527,000) $ (634,000) $ (672,000) $ (609,000)
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Loan Gross 12,585,000   12,962,000      
Principal loan balance 12,585,000   12,962,000      
Deferred loan origination fees, net 11,000   6,000      
Allowance for loan losses (47,000) (84,000) (157,000) (173,000) (197,000) (201,000)
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]            
Loan Gross 17,357,000   16,391,000      
Principal loan balance 10,497,000   12,555,000      
Deferred loan origination fees, net 0   0      
Allowance for loan losses (42,000) (45,000) (47,000) (51,000) (65,000) (60,000)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]            
Loan Gross 93,508,000   84,493,000      
Principal loan balance 93,477,000   84,493,000      
Deferred loan origination fees, net (37,000)   (46,000)      
Allowance for loan losses (1,473,000) (1,468,000) (1,541,000) (1,669,000) (1,462,000) (1,501,000)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Construction [Member]            
Loan Gross 2,536,000   1,090,000      
Commercial Portfolio Segment [Member]            
Loan Gross 23,185,000   23,095,000      
Principal loan balance 23,185,000   23,095,000      
Deferred loan origination fees, net (7,000)   (6,000)      
Allowance for loan losses (162,000) (273,000) (261,000) (161,000) (239,000) (1,480,000)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Loan Gross 40,987,000   38,476,000      
Principal loan balance 40,987,000   38,476,000      
Deferred loan origination fees, net 654,000   571,000      
Allowance for loan losses (791,000) (721,000) (626,000) (648,000) (716,000) (720,000)
Consumer Portfolio Segment [Member] | Automobile Loan [Member]            
Loan Gross 31,831,000   28,828,000      
Consumer Portfolio Segment [Member] | Loans Secured by Saving Accounts [Member]            
Loan Gross 1,924,000   2,096,000      
Consumer Portfolio Segment [Member] | Unsecured Loan [Member]            
Loan Gross 3,827,000   4,350,000      
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]            
Loan Gross 7,838,000   7,210,000      
Principal loan balance 45,420,000   42,484,000      
Deferred loan origination fees, net 0   0      
Allowance for loan losses (266,000) (258,000) (256,000) (264,000) (283,000) (275,000)
Loan Gross 374,023,000   366,924,000      
Less undisbursed portion of loans in process (9,396,000)   (4,926,000)      
Principal loan balance 364,627,000   361,998,000      
Deferred loan origination fees, net 691,000   583,000      
Allowance for loan losses (3,189,000) $ (3,319,000) (3,415,000) $ (3,600,000) $ (3,634,000) $ (4,846,000)
Loans, net $ 362,129,000   $ 359,166,000