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Note 3 - Loans Receivable - Loans Modified in TDR by Class of Loan (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
Dec. 31, 2015
Number of contracts 1 0 2
Pre-modification outstanding recorded investment $ 229    
Post-modification outstanding recorded investment $ 247    
Construction Loan Portfolio Segment [Member] | Residential [Member]      
Number of contracts    
Pre-modification outstanding recorded investment    
Post-modification outstanding recorded investment    
Construction Loan Portfolio Segment [Member] | Land Acquisition Development And Commercial [Member]      
Number of contracts    
Pre-modification outstanding recorded investment    
Post-modification outstanding recorded investment    
Real Estate Portfolio Segment [Member] | Residential [Member]      
Number of contracts    
Pre-modification outstanding recorded investment    
Post-modification outstanding recorded investment    
Real Estate Portfolio Segment [Member] | Commercial [Member]      
Number of contracts 1    
Pre-modification outstanding recorded investment $ 218    
Post-modification outstanding recorded investment $ 218    
Commercial Industrial and Agricultural Portfolio Segment [Member]      
Number of contracts    
Pre-modification outstanding recorded investment $ 11    
Post-modification outstanding recorded investment $ 29    
Equity Lines Portfolio Segment [Member]      
Number of contracts    
Pre-modification outstanding recorded investment    
Post-modification outstanding recorded investment    
Consumer Portfolio Segment [Member]      
Number of contracts    
Pre-modification outstanding recorded investment    
Post-modification outstanding recorded investment