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Note 3 - Loans Receivable - Classifications of Loans Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans $ 434,501 $ 418,991  
Less allowance for loan losses (3,700) (3,636) [1] $ (3,298)
Loans, net 430,801 415,355 [2]  
Construction Loan Portfolio Segment [Member] | Residential [Member]      
Loans 9,990 10,204  
Less allowance for loan losses (61) (63) (83)
Construction Loan Portfolio Segment [Member] | Land Acquisition Development And Commercial [Member]      
Loans 31,778 27,480  
Less allowance for loan losses (204) (173) (187)
Real Estate Portfolio Segment [Member] | Residential [Member]      
Loans 113,434 111,626  
Less allowance for loan losses (815) (866) (1,047)
Real Estate Portfolio Segment [Member] | Commercial [Member]      
Loans 180,121 172,248  
Less allowance for loan losses (1,739) (1,516) (1,001)
Commercial Industrial And Agricultural Portfolio Segment Excluding Overdrafts [Member]      
Loans 61,404 59,702  
Equity Lines Portfolio Segment [Member]      
Loans 30,519 29,956  
Less allowance for loan losses (281) (338) (277)
Consumer Portfolio Segment [Member]      
Loans 7,200 7,668  
Less allowance for loan losses (97) (97) $ (85)
Overdrafts Portfolio Segment [Member]      
Loans $ 55 $ 107  
[1] Derived from consolidated audited financial statements.
[2] Derived from consolidated audited financial statements.