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Note 6 - Investment Securities Available for Sale (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
September 30, 2017
  
           
Gross
    
Gross
          
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
(Dollar amounts in thousands)
  
Cost
    
Gains
    
Losses
    
Value
  
                                 
U.S. government agency
securities
   $
9,004
     $
146
     $
(56
 )   $
9,094
  
Obligations of states and
political subdivisions:
                                
Taxable
    
505
      
12
      
-
      
517
  
Tax-exempt
    
69,750
      
1,886
      
(59
 )    
71,577
  
Mortgage-backed securities in
government-sponsored entities
    
16,574
      
175
      
(170
 )    
16,579
  
Total debt securities
    
95,833
      
2,219
      
(285
 )    
97,767
  
Equity securities in financial institutions
    
415
      
152
      
-
      
567
  
Total
   $
96,248
     $
2,371
     $
(285
 )   $
98,334
  
   
December 31, 2016
  
           
Gross
    
Gross
          
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
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
   $
4,689
     $
4,742
  
Due after one year through five years
    
9,884
      
10,193
  
Due after five years through ten years
    
9,643
      
9,783
  
Due after ten years
    
71,617
      
73,049
  
Total
   $
95,833
     $
97,767
  
Realized Gain (Loss) on Investments [Table Text Block]
(Dollar amounts in thousands)
  
For the Three Months
Ended September 30,
    
For the Nine Months
Ended September 30,
  
   
2017
    
2016
    
2017
    
2016
  
Proceeds from sales
   $
3,787
     $
-
     $
6,474
     $
9,115
  
Gross realized gains
    
430
      
-
      
918
*
    
306
  
Gross realized losses
    
(32
 )    
-
      
(32
 )    
(3
 )
Schedule of Unrealized Loss on Investments [Table Text Block]
   
September 30, 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
   $
952
     $
(9
 )   $
3,211
     $
(47
 )   $
4,163
     $
(56
 )
Obligations of states and political
subdivisions
                                                
Tax-exempt
    
3,008
      
(18
 )    
2,112
      
(41
 )    
5,120
      
(59
 )
Mortgage-backed securities in
government-sponsored entities
    
7,997
      
(57
 )    
3,798
      
(113
 )    
11,795
      
(170
 )
Total
   $
11,957
     $
(84
 )   $
9,121
     $
(201
 )   $
21,078
     $
(285
 )
   
December 31, 2016
  
   
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
   $
3,803
     $
(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
 )