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Note 4 - Investment and Equity Securities (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
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
 
   
December 31, 2017
 
           
Gross
   
Gross
         
   
Amortized
   
Unrealized
   
Unrealized
   
Fair
 
(Dollar amounts in thousands)
 
Cost
   
Gains
   
Losses
   
Value
 
                                 
U.S. government agency securities
  $
8,664
    $
126
    $
(71
)   $
8,719
 
Obligations of states and political subdivisions:
                               
Taxable
   
504
     
8
     
-
     
512
 
Tax-exempt
   
65,408
     
1,547
     
(38
)    
66,917
 
Mortgage-backed securities in government-sponsored entities
   
18,640
     
157
     
(287
)    
18,510
 
Total debt securities
   
93,216
     
1,838
     
(396
)    
94,658
 
Equity securities in financial institutions
   
415
     
210
     
-
     
625
 
Total
  $
93,631
    $
2,048
    $
(396
)   $
95,283
 
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized
   
Fair
 
(Dollar amounts in thousands)
 
Cost
   
Value
 
                 
Due in one year or less
  $
8,547
    $
8,590
 
Due after one year through five years
   
2,108
     
2,132
 
Due after five years through ten years
   
13,173
     
13,133
 
Due after ten years
   
74,688
     
74,467
 
                 
Total
  $
98,516
    $
98,322
 
Realized Gain (Loss) on Investments [Table Text Block]
   
2017
 
Proceeds from sales
  $
6,474
 
Gross realized gains
   
911
 *
Gross realized losses
   
(25
)
Schedule of Unrealized Loss on Investments [Table Text Block]
   
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
)
   
December 31, 2017
 
   
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
  $
557
    $
(4
)   $
4,036
    $
(67
)   $
4,593
    $
(71
)
Obligations of states and political subdivisions
                                               
Tax-exempt
   
1,009
     
(6
)    
2,784
     
(32
)    
3,793
     
(38
)
Mortgage-backed securities in government-sponsored entities
   
5,698
     
(71
)    
8,734
     
(216
)    
14,432
     
(287
)
Total
  $
7,264
    $
(81
)   $
15,554
    $
(315
)   $
22,818
    $
(396
)