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Note 6 - Investment Securities Available for Sale (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
June 30, 2016
 
           
Gross
   
Gross
         
   
Amortized
   
Unrealized
   
Unrealized
   
Fair
 
(Dollar amounts in thousands)
 
Cost
   
Gains
   
Losses
   
Value
 
                                 
U.S. government agency securities   $ 14,967     $ 378     $ (10 )   $ 15,335  
Obligations of states and political subdivisions:                                
Taxable
    1,618       186       -       1,804  
Tax-exempt
    81,895       4,656       -       86,551  
Mortgage-backed securities in government-sponsored entities     22,261       508       (50 )     22,719  
Private-label mortgage-backed securities
    1,927       146       (1 )     2,072  
Total debt securities
    122,668       5,874       (61 )     128,481  
Equity securities in financial institutions
    750       64       -       814  
Total
  $ 123,418     $ 5,938     $ (61 )   $ 129,295  
   
December 31, 2015
 
           
Gross
   
Gross
         
   
Amortized
   
Unrealized
   
Unrealized
   
Fair
 
   
Cost
   
Gains
   
Losses
   
Value
 
                                 
U.S. government agency securities   $ 21,655     $ 245     $ (271 )   $ 21,629  
Obligations of states and political subdivisions:                                
Taxable
    1,989       134       -       2,123  
Tax-exempt
    91,940       3,402       (175 )     95,167  
Mortgage-backed securities in government-sponsored entities     24,480       316       (272 )     24,524  
Private-label mortgage-backed securities
    2,079       184       -       2,263  
Total debt securities
    142,143       4,281       (718 )     145,706  
Equity securities in financial institutions
    750       64       -       814  
Total
  $ 142,893     $ 4,345     $ (718 )   $ 146,520  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized
   
Fair
 
(Dollar amounts in thousands)
 
Cost
   
Value
 
                 
Due in one year or less
  $ 1,965     $ 2,010  
Due after one year through five years
    8,452       8,670  
Due after five years through ten years
    15,563       16,323  
Due after ten years
    96,688       101,478  
                 
Total
  $ 122,668     $ 128,481  
Realized Gain (Loss) on Investments [Table Text Block]
(Dollar amounts in thousands)  
For the Three Months Ended June 30,
   
For the Six Months Ended June 30,
 
   
2016
   
2015
   
2016
   
2015
 
Proceeds from sales
  $ 7,793     $ 1,721     $ 9,115     $ 3,312  
Gross realized gains
    255       92       306       140  
Gross realized losses
    (3 )     (70 )     (3 )     (94 )
Schedule of Unrealized Loss on Investments [Table Text Block]
   
June 30, 2016
 
   
Less than Twelve Months
   
Twelve Months or Greater
   
Total
 
           
Gross
           
Gross
           
Gross
 
   
Fair
   
Unrealized
   
Fair
   
Unrealized
   
Fair
   
Unrealized
 
(Dollar amounts in thousands)
 
Value
   
Losses
   
Value
   
Losses
   
Value
   
Losses
 
                                                 
U.S. government agency securities
  $ -     $ -     $ 1,469     $ (10 )   $ 1,469     $ (10 )
Mortgage-backed securities in government-sponsored entities
    -       -       6,309       (50 )     6,309       (50 )
Private-label mortgage-backed securities
    94       (1 )     -       -       94       (1 )
Total   $ 94     $ (1 )   $ 7,778     $ (60 )   $ 7,872     $ (61 )
   
December 31, 2015
 
   
Less than Twelve Months
   
Twelve Months or Greater
   
Total
 
           
Gross
           
Gross
           
Gross
 
   
Fair
   
Unrealized
   
Fair
   
Unrealized
   
Fair
   
Unrealized
 
   
Value
   
Losses
   
Value
   
Losses
   
Value
   
Losses
 
                                                 
U.S. government agency securities
  $ 3,818     $ (57 )   $ 10,872     $ (214 )   $ 14,690     $ (271 )
Obligations of states and political subdivisions Tax-exempt     1,268       (9 )     9,394       (166 )     10,662       (175 )
Mortgage-backed securities in government-sponsored entities
    8,725       (86 )     6,685       (186 )     15,410       (272 )
Total   $ 13,811     $ (152 )   $ 26,951     $ (566 )   $ 40,762     $ (718 )