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Note 3 - Loans Receivable - Impaired Loans (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Loans with no related allowance, recorded investment in loans $ 5,750 $ 5,317
Loans with no related allowance, unpaid principal balance 5,900 5,922
Related allowance
Loans with no related allowance, average balance total loans 6,157 5,814
Loans with no related allowance, interest income recognized 94 230
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
Loans with a related allowance, average balance total loans 54
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
Related allowance
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
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 223 181
Loans with no related allowance, unpaid principal balance 373 331
Related allowance
Loans with no related allowance, average balance total loans 523 331
Loans with no related allowance, interest income recognized 10
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
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 623 360
Loans with no related allowance, unpaid principal balance 623 640
Related allowance
Loans with no related allowance, average balance total loans 635 638
Loans with no related allowance, interest income recognized 8 30
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
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 4,301 4,098
Loans with no related allowance, unpaid principal balance 4,301 4,273
Related allowance
Loans with no related allowance, average balance total loans 4,385 4,166
Loans with no related allowance, interest income recognized 78 161
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
Loans with a related allowance, average balance total loans 54
Loans with a related allowance, interest income recognized
Commercial Industrial and Agricultural Portfolio Segment [Member]    
Loans with no related allowance, recorded investment in loans 182 379
Loans with no related allowance, unpaid principal balance 182 379
Related allowance
Loans with no related allowance, average balance total loans 191 379
Loans with no related allowance, interest income recognized 15
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
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 421 299
Loans with no related allowance, unpaid principal balance 421 299
Related allowance
Loans with no related allowance, average balance total loans 423 300
Loans with no related allowance, interest income recognized 8 14
Loans with a related allowance, recorded investment in loans
Loans with a related allowance, unpaid principal balance
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
Related allowance
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
Loans with a related allowance, average balance total loans
Loans with a related allowance, interest income recognized