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Note 3 - Loans Receivable - Impaired Loans (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Loans with a related allowance, interest income recognized
Loans with no related allowance, recorded investment in loans 7,387 7,161
Loans with no related allowance, unpaid principal balance 7,563 7,337
Loans with no related allowance, average balance total loans 7,849 7,161
Loans with no related allowance, interest income recognized 91 244
Loans with a related allowance, recorded investment in loans 108 115
Loans with a related allowance, unpaid principal balance 108 115
Related Allowance 17 17
Loans with a related allowance, average balance total loans 112 122
Construction Loan Portfolio Segment [Member] | Residential [Member]    
Loans with a related allowance, interest income recognized
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
Construction Loan Portfolio Segment [Member] | Land Acquisition Development And Commercial [Member]    
Loans with a related allowance, interest income recognized
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
Real Estate Portfolio Segment [Member] | Residential [Member]    
Loans with a related allowance, interest income recognized
Loans with no related allowance, recorded investment in loans 767 770
Loans with no related allowance, unpaid principal balance 767 770
Loans with no related allowance, average balance total loans 768 629
Loans with no related allowance, interest income recognized 11 (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
Real Estate Portfolio Segment [Member] | Commercial [Member]    
Loans with a related allowance, interest income recognized
Loans with no related allowance, recorded investment in loans 6,593 6,380
Loans with no related allowance, unpaid principal balance 6,769 6,556
Loans with no related allowance, average balance total loans 7,053 6,521
Loans with no related allowance, interest income recognized 80 255
Loans with a related allowance, recorded investment in loans 108 115
Loans with a related allowance, unpaid principal balance 108 115
Related Allowance 17 17
Loans with a related allowance, average balance total loans 112 122
Commercial Industrial and Agricultural Portfolio Segment [Member]    
Loans with a related allowance, interest income recognized
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
Equity Lines Portfolio Segment [Member]    
Loans with a related allowance, interest income recognized
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
Consumer Portfolio Segment [Member]    
Loans with a related allowance, interest income recognized
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