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Note 3 - Loans Receivable (Details) - Impaired Loans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Construction:    
Loans with no related allowance, recorded investment $ 7,710 $ 8,032
Loans with no related allowance, unpaid principal balance 7,886 8,207
Loans with no related allowance, average balance total loans 7,890 9,168
Loans with no related allowance, interest income recognized 304 301
Construction:    
Loans with an related allowance, recorded investment 127 141
Loans with an related allowance, unpaid principal balance 127 141
Loans, related allowance 17 141
Loans with an related allowance, average balance total loans 135 153
Real Estate Portfolio Segment [Member] | Residential [Member]    
Construction:    
Loans with no related allowance, recorded investment 247 525
Loans with no related allowance, unpaid principal balance 247 700
Loans with no related allowance, average balance total loans 255 605
Loans with no related allowance, interest income recognized 13 12
Real Estate Portfolio Segment [Member] | Commercial [Member}    
Construction:    
Loans with no related allowance, recorded investment 7,451 7,507
Loans with no related allowance, unpaid principal balance 7,627 7,507
Loans with no related allowance, average balance total loans 7,623 8,563
Loans with no related allowance, interest income recognized 291 289
Construction:    
Loans with an related allowance, recorded investment 127 141
Loans with an related allowance, unpaid principal balance 127 141
Loans, related allowance 17 141
Loans with an related allowance, average balance total loans 135 $ 153
Commercial, Industrial and Agricultural Portfolio Segment [Member]    
Construction:    
Loans with an related allowance, recorded investment 12  
Loans with an related allowance, unpaid principal balance 12  
Loans with an related allowance, average balance total loans $ 12