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Note 3 - Loans Receivable - Classifications of Loans Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans $ 461,452 $ 444,195  
Less allowance for loan losses (3,917) (3,758) [1] $ (3,636)
Loans, net 457,535 440,437 [2]  
Construction Loan Portfolio Segment [Member] | Residential [Member]      
Loans 20,143 15,221  
Less allowance for loan losses (141) (94) (63)
Construction Loan Portfolio Segment [Member] | Land Acquisition Development And Commercial [Member]      
Loans 21,343 35,601  
Less allowance for loan losses (195) (311) (173)
Real Estate Portfolio Segment [Member] | Residential [Member]      
Loans 134,721 121,649  
Less allowance for loan losses (1,008) (955) (866)
Real Estate Portfolio Segment [Member] | Commercial [Member]      
Loans 188,677 173,999  
Less allowance for loan losses (1,737) (1,603) (1,516)
Commercial Industrial And Agricultural Portfolio Segment Excluding Overdrafts [Member]      
Loans 59,472 61,129  
Equity Lines Portfolio Segment [Member]      
Loans 29,294 28,835  
Less allowance for loan losses (239) (237) (338)
Consumer Portfolio Segment [Member]      
Loans 7,683 7,693  
Less allowance for loan losses (135) (108) $ (97)
Overdrafts Portfolio Segment [Member]      
Loans $ 119 $ 68  
[1] Derived from consolidated audited financial statements.
[2] Derived from consolidated audited financial statements.