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Note 3 - Investment Securities Available for Sale (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
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
 
   
December 31, 2016
 
           
Gross
   
Gross
         
   
Amortized
   
Unrealized
   
Unrealized
   
Fair
 
(Dollar amounts in thousands)
 
Cost
   
Gains
   
Losses
   
Value
 
                                 
U.S. government agency securities
  $
10,158
    $
174
    $
(96
)   $
10,236
 
Obligations of states and political subdivisions:
                               
Taxable
   
1,615
     
129
     
(4
)    
1,740
 
Tax-exempt
   
78,327
     
1,678
     
(522
)    
79,483
 
Mortgage-backed securities in government-sponsored entities
   
20,128
     
202
     
(261
)    
20,069
 
Private-label mortgage-backed securities
   
1,579
     
130
     
-
     
1,709
 
Total debt securities
   
111,807
     
2,313
     
(883
)    
113,237
 
Equity securities in financial institutions
   
750
     
389
     
-
     
1,139
 
Total
  $
112,557
    $
2,702
    $
(883
)   $
114,376
 
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized
   
Fair
 
(Dollar amounts in thousands)
 
Cost
   
Value
 
                 
Due in one year or less
  $
2,340
    $
2,377
 
Due after one year through five years
   
9,718
     
9,878
 
Due after five years through ten years
   
10,992
     
11,012
 
Due after ten years
   
70,166
     
71,391
 
                 
Total
  $
93,216
    $
94,658
 
Realized Gain (Loss) on Investments [Table Text Block]
   
2017
   
2016
   
2015
 
Proceeds from sales
  $
6,474
    $
9,063
    $
15,686
 
Gross realized gains
   
911
 
*  
309
     
440
 
Gross realized losses
   
(25
)    
(6
)    
(117
)
Schedule of Unrealized Loss on Investments [Table Text Block]
   
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
)
   
December 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
  $
3,803
    $
(47
)   $
1,316
    $
(49
)   $
5,119
    $
(96
)
Obligations of states and political subdivisions
                                               
Taxable
   
502
     
(4
)    
-
     
-
     
502
     
(4
)
Tax-exempt
   
23,554
     
(522
)    
-
     
-
     
23,554
     
(522
)
Mortgage-backed securities in government-sponsored entities
   
9,066
     
(126
)    
4,438
     
(135
)    
13,504
     
(261
)
Total
  $
36,925
    $
(699
)   $
5,754
    $
(184
)   $
42,679
    $
(883
)