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Note 3 - Loans Receivable - Impaired Loans (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Loans with no related allowance, recorded investment in loans $ 4,816 $ 7,161
Loans with no related allowance, unpaid principal balance 4,992 7,337
Loans with no related allowance, average balance total loans 4,852 7,161
Loans with no related allowance, interest income recognized 135 244
Loans with a related allowance, recorded investment in loans 115
Loans with a related allowance, unpaid principal balance 115
Related Allowance 17
Loans with a related allowance, average balance total loans 122
Loans with a related allowance, interest income recognized
Construction Loan Portfolio Segment [Member] | Residential [Member]    
Loans with no related allowance, recorded investment in loans
Loans with no related allowance, unpaid principal balance
Loans with no related allowance, average balance total loans
Loans with no related allowance, interest income recognized
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
Related Allowance
Loans with a related allowance, average balance total loans
Loans with a related allowance, interest income recognized
Construction Loan Portfolio Segment [Member] | Land Acquisition Development And Commercial [Member]    
Loans with no related allowance, recorded investment in loans
Loans with no related allowance, unpaid principal balance
Loans with no related allowance, average balance total loans
Loans with no related allowance, interest income recognized
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
Related Allowance
Loans with a related allowance, average balance total loans
Loans with a related allowance, interest income recognized
Real Estate Portfolio Segment [Member] | Residential [Member]    
Loans with no related allowance, recorded investment in loans 648 770
Loans with no related allowance, unpaid principal balance 648 770
Loans with no related allowance, average balance total loans 652 629
Loans with no related allowance, interest income recognized 14 (11)
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
Related Allowance
Loans with a related allowance, average balance total loans
Loans with a related allowance, interest income recognized
Real Estate Portfolio Segment [Member] | Commercial [Member]    
Loans with no related allowance, recorded investment in loans 4,141 6,380
Loans with no related allowance, unpaid principal balance 4,317 6,556
Loans with no related allowance, average balance total loans 4,172 6,521
Loans with no related allowance, interest income recognized 121 255
Loans with a related allowance, recorded investment in loans 115
Loans with a related allowance, unpaid principal balance 115
Related Allowance 17
Loans with a related allowance, average balance total loans 122
Loans with a related allowance, interest income recognized
Commercial Industrial and Agricultural Portfolio Segment [Member]    
Loans with no related allowance, recorded investment in loans 27 11
Loans with no related allowance, unpaid principal balance 27 11
Loans with no related allowance, average balance total loans 28 11
Loans with no related allowance, interest income recognized
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
Related Allowance
Loans with a related allowance, average balance total loans
Loans with a related allowance, interest income recognized
Equity Lines Portfolio Segment [Member]    
Loans with no related allowance, recorded investment in loans
Loans with no related allowance, unpaid principal balance
Loans with no related allowance, average balance total loans
Loans with no related allowance, interest income recognized
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
Related Allowance
Loans with a related allowance, average balance total loans
Loans with a related allowance, interest income recognized
Consumer Portfolio Segment [Member]    
Loans with no related allowance, recorded investment in loans
Loans with no related allowance, unpaid principal balance
Loans with no related allowance, average balance total loans
Loans with no related allowance, interest income recognized
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
Related Allowance
Loans with a related allowance, average balance total loans
Loans with a related allowance, interest income recognized