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Note 3 - Loans Receivable (Details) - Impaired Loans - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Construction loans:    
Loans with no related allowance, recorded investment $ 7,845 $ 8,032
Loans with no related allowance, unpaid principal balance 7,845 8,207
Loans with no related allowance, average balance total loans 7,927 9,168
Loans with no related allowance, interest income recognized 216 301
Construction loans:    
Loans with an related allowance, recorded investment 132 141
Loans with an related allowance, unpaid principal balance 132 141
Loans, related allowance 132 141
Loans with an related allowance, average balance total loans 137 153
Real Estate Portfolio Segment [Member] | Residential [Member]    
Construction loans:    
Loans with no related allowance, recorded investment 249 525
Loans with no related allowance, unpaid principal balance 249 700
Loans with no related allowance, average balance total loans 257 605
Loans with no related allowance, interest income recognized 6 12
Real Estate Portfolio Segment [Member] | Commercial [Member}    
Construction loans:    
Loans with no related allowance, recorded investment 7,584 7,507
Loans with no related allowance, unpaid principal balance 7,584 7,507
Loans with no related allowance, average balance total loans 7,658 8,563
Loans with no related allowance, interest income recognized 210 289
Construction loans:    
Loans with an related allowance, recorded investment 132 141
Loans with an related allowance, unpaid principal balance 132 141
Loans, related allowance 132 141
Loans with an related allowance, average balance total loans 137 $ 153
Commercial, Industrial and Agricultural Portfolio Segment [Member]    
Construction loans:    
Loans with no related allowance, recorded investment 12  
Loans with no related allowance, unpaid principal balance 12  
Loans with no related allowance, average balance total loans $ 12