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Note 3 - Loans Receivable - Classifications of Loans Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans $ 434,810 $ 418,991  
Less allowance for loan losses (3,706) (3,636) [1] $ (3,298)
Loans, net 431,104 415,355 [2]  
Construction Loan Portfolio Segment [Member] | Residential [Member]      
Loans 12,278 10,204  
Less allowance for loan losses (89) (63) (83)
Construction Loan Portfolio Segment [Member] | Land Acquisition Development And Commercial [Member]      
Loans 33,915 27,480  
Less allowance for loan losses (223) (173) (187)
Real Estate Portfolio Segment [Member] | Residential [Member]      
Loans 117,114 111,626  
Less allowance for loan losses (870) (866) (1,047)
Real Estate Portfolio Segment [Member] | Commercial [Member]      
Loans 173,713 172,248  
Less allowance for loan losses (1,686) (1,516) (1,001)
Commercial Industrial And Agricultural Portfolio Segment Excluding Overdrafts [Member]      
Loans 61,070 59,702  
Equity Lines Portfolio Segment [Member]      
Loans 28,914 29,956  
Less allowance for loan losses (245) (338) (277)
Consumer Portfolio Segment [Member]      
Loans 7,724 7,668  
Less allowance for loan losses (99) (97) $ (85)
Overdrafts Portfolio Segment [Member]      
Loans $ 82 $ 107  
[1] Derived from consolidated audited financial statements.
[2] Derived from consolidated audited financial statements.