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Note 6 - Investment Securities Available for Sale (Tables)
3 Months Ended
Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   

March 31, 2016

 
           

Gross

   

Gross

         
   

Amortized

   

Unrealized

   

Unrealized

   

Fair

 

(Dollar amounts in thousands)

 

Cost

   

Gains

   

Losses

   

Value

 
                                 

U.S. government agency securities

  $ 18,616     $ 313     $ (76 )   $ 18,853  

Obligations of states and political subdivisions:

                               

Taxable

    1,989       187       (1 )     2,175  

Tax-exempt

    91,605       3,394       (173 )     94,826  

Mortgage-backed securities in government-sponsored entities

    23,550       380       (117 )     23,813  

Private-label mortgage-backed securities

    1,927       153       (1 )     2,079  

Total debt securities

    137,687       4,427       (368 )     141,746  

Equity securities in financial institutions

    750       64       -       814  

Total

  $ 138,437     $ 4,491     $ (368 )   $ 142,560  
   

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

  $ 1,224     $ 1,237  

Due after one year through five years

    11,171       11,380  

Due after five years through ten years

    18,523       19,327  

Due after ten years

    106,769       109,802  
                 

Total

  $ 137,687     $ 141,746  
Realized Gain (Loss) on Investments [Table Text Block]
(Dollar amounts in thousands)  

For the Three Months

Ended March 31,

 
   

2016

   

2015

 

Proceeds from sales

  $ 1,322     $ 1,590  

Gross realized gains

    51       48  

Gross realized losses

    -       (24 )
Schedule of Unrealized Loss on Investments [Table Text Block]
   

March 31, 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

  $ 4,565     $ (9 )   $ 7,612     $ (67 )   $ 12,177     $ (76 )

Obligations of states and political subdivisions

    8,999       (122 )     1,426       (52 )     10,425       (174 )

Mortgage-backed securities in government-sponsored entities

    4,000       (7 )     6,675       (110 )     10,675       (117 )

Private-label mortgage-backed securities

    109       (1 )     -       -       109       (1 )

Total

  $ 17,673     $ (139 )   $ 15,713     $ (229 )   $ 33,386     $ (368 )
   

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 )