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Note 6 - Investment Securities Available for Sale (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
September 30, 2016
 
           
Gross
   
Gross
         
   
Amortized
   
Unrealized
   
Unrealized
   
Fair
 
(Dollar amounts in thousands)
 
Cost
   
Gains
   
Losses
   
Value
 
                                 
U.S. government agency
securities
  $ 10,516     $ 359     $ (12 )   $ 10,863  
Obligations of states and
political subdivisions:
                               
Taxable
    1,616       186       -       1,802  
Tax-exempt
    81,829       3,899       (5 )     85,723  
Mortgage-backed securities in
government-sponsored entities
    20,939       485       (44 )     21,380  
Private-label mortgage-backed securities
    1,927       141       -       2,068  
Total debt securities
    116,827       5,070       (61 )     121,836  
Equity securities in financial institutions
    750       468       -       1,218  
Total
  $ 117,577     $ 5,538     $ (61 )   $ 123,054  
   
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
  $ 2,842     $ 2,879  
Due after one year through five years
    9,132       9,500  
Due after five years through ten years
    12,916       13,510  
Due after ten years
    91,937       95,947  
                 
Total
  $ 116,827     $ 121,836  
Realized Gain (Loss) on Investments [Table Text Block]
   
For the Three Months
Ended September 30,
   
For the Nine Months
Ended September 30,
 
   
2016
   
2015
   
2016
   
2015
 
Proceeds from sales
  $ -     $ 11,973     $ 9,115     $ 15,284  
Gross realized gains
    -       233       306       373  
Gross realized losses
    -       (22 )     (3 )     (116 )
Schedule of Unrealized Loss on Investments [Table Text Block]
       
September 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
  $ 2,000     $ -     $ 1,465     $ (12 )   $ 3,465     $ (12 )
Obligations of states and political subdivisions                                                
Tax-exempt     608       -       -       (5 )     608       (5 )
Mortgage-backed securities in
government-sponsored entities
    -       -       4,709       (44 )     4,709       (44 )
Private-label mortgage-backed securities
    75       -       -       -       75       -  
Total
  $ 2,683     $ -     $ 6,174     $ (61 )   $ 8,857     $ (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 )