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Note 3 - Loans Receivable - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Loans with no related allowance, recorded investment in loans $ 5,352 $ 5,317
Loans with no related allowance, unpaid principal balance 5,495 5,922
Related allowance
Loans with no related allowance, average balance total loans 5,421 5,814
Loans with no related allowance, interest income recognized 17 230
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 181 181
Loans with no related allowance, unpaid principal balance 331 331
Related allowance
Loans with no related allowance, average balance total loans 181 331
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 427 360
Loans with no related allowance, unpaid principal balance 427 640
Related allowance
Loans with no related allowance, average balance total loans 431 638
Loans with no related allowance, interest income recognized 1 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 4,435 4,098
Loans with no related allowance, unpaid principal balance 4,428 4,273
Related allowance
Loans with no related allowance, average balance total loans 4,497 4,166
Loans with no related allowance, interest income recognized 15 161
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 10 379
Loans with no related allowance, unpaid principal balance 10 379
Related allowance
Loans with no related allowance, average balance total loans 13 379
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 299 299
Loans with no related allowance, unpaid principal balance 299 299
Related allowance
Loans with no related allowance, average balance total loans 299 300
Loans with no related allowance, interest income recognized 1 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