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Note 7 - Investment and Equity Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
March 31, 2019
  
           
Gross
    
Gross
          
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
(Dollar amounts in thousands)
  
Cost
    
Gains
    
Losses
    
Value
  
                                 
U.S. government agency securities
   $
7,120
     $
111
     $
(49
 )   $
7,182
  
Obligations of states and political subdivisions:
                                
Taxable
    
501
      
8
      
-
      
509
  
Tax-exempt
    
69,233
      
1,057
      
(64
 )    
70,226
  
Mortgage-backed securities in government-sponsored entities
    
20,448
      
112
      
(363
 )    
20,197
  
Total
   $
97,302
     $
1,288
     $
(476
 )   $
98,114
  
   
December 31, 2018
  
           
Gross
    
Gross
          
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
(Dollar amounts in thousands)
  
Cost
    
Gains
    
Losses
    
Value
  
                                 
U.S. government agency securities
   $
7,442
     $
90
     $
(61
 )   $
7,471
  
Obligations of states and political subdivisions:
                                
Taxable
    
502
      
10
      
-
      
512
  
Tax-exempt
    
72,387
      
667
      
(473
 )    
72,581
  
Mortgage-backed securities in government-sponsored entities
    
18,185
      
88
      
(515
 )    
17,758
  
Total
   $
98,516
     $
855
     $
(1,049
 )   $
98,322
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized
    
Fair
  
(Dollar amounts in thousands)
  
Cost
    
Value
  
                 
Due in one year or less
   $
6,479
     $
6,519
  
Due after one year through five years
    
1,665
      
1,683
  
Due after five years through ten years
    
13,024
      
13,074
  
Due after ten years
    
76,134
      
76,838
  
Total
   $
97,302
     $
98,114
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
March 31, 2019
  
   
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
   $
-
     $
-
     $
2,927
     $
(49
 )   $
2,927
     $
(49
 )
Obligations of states and political subdivisions:
                                                
Tax-exempt
    
926
      
(4
 )    
7,954
      
(60
 )    
8,880
      
(64
 )
Mortgage-backed securities in government-sponsored entities
    
2,063
      
(4
 )    
12,074
      
(359
 )    
14,137
      
(363
 )
Total
   $
2,989
     $
(8
 )   $
22,955
     $
(468
 )   $
25,944
     $
(476
 )
   
December 31, 2018
  
   
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
   $
-
     $
-
     $
4,105
     $
(61
 )   $
4,105
     $
(61
 )
Obligations of states and political subdivisions:
                                                
Tax-exempt
    
20,451
      
(286
 )    
11,053
      
(187
 )    
31,504
      
(473
 )
Mortgage-backed securities in government-sponsored entities
    
2,068
      
(9
 )    
12,257
      
(506
 )    
14,325
      
(515
 )
Total
   $
22,519
     $
(295
 )   $
27,415
     $
(754
 )   $
49,934
     $
(1,049
 )