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Note 3 - Loans Receivable - Impaired Loans (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Loans with no related allowance, recorded investment in loans $ 5,452 $ 5,317
Loans with no related allowance, unpaid principal balance 5,452 5,922
Loans with no related allowance, average balance total loans 5,576 5,814
Loans with no related allowance, interest income recognized 149 230
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 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
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 43 181
Loans with no related allowance, unpaid principal balance 43 331
Loans with no related allowance, average balance total loans 43 331
Loans with no related allowance, interest income recognized 1 10
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 667 360
Loans with no related allowance, unpaid principal balance 667 640
Loans with no related allowance, average balance total loans 683 638
Loans with no related allowance, interest income recognized 16 30
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 4,264 4,098
Loans with no related allowance, unpaid principal balance 4,264 4,273
Loans with no related allowance, average balance total loans 4,367 4,166
Loans with no related allowance, interest income recognized 120 161
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 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 180 379
Loans with no related allowance, unpaid principal balance 180 379
Loans with no related allowance, average balance total loans 185 379
Loans with no related allowance, interest income recognized 2 15
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 298 299
Loans with no related allowance, unpaid principal balance 298 299
Loans with no related allowance, average balance total loans 298 300
Loans with no related allowance, interest income recognized 10 14
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