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Note 3 - Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Available-for-sale Securities [Table Text Block]
    (Dollars in thousands)
    September 30, 2017
    Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value
                 
U.S. Government Agencies   $
59,622
     $
-
     $
(1,242
 )   $
58,380
  
Obligations of States and Political Subdivisions    
37,616
      
314
      
(122
 )    
37,808
  
Mortgage-Backed Securities - Government-Sponsored Enterprises    
17,890
      
14
      
(45
 )    
17,859
  
Equity Securities - Mutual Funds    
500
      
10
      
-
      
510
  
Equity Securities - Other    
1,253
      
94
      
(15
 )    
1,332
  
Total   $
116,881
     $
432
     $
(1,424
 )   $
115,889
  
    December 31, 2016
    Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value
                 
U.S. Government Agencies   $
67,944
     $
18
     $
(1,806
 )   $
66,156
  
Obligations of States and Political Subdivisions    
35,856
      
366
      
(487
 )    
35,735
  
Mortgage-Backed Securities - Government-Sponsored Enterprises    
2,588
      
31
      
-
      
2,619
  
Equity Securities - Mutual Funds    
500
      
7
      
-
      
507
  
Equity Securities - Other    
1,106
      
91
      
(6
 )    
1,191
  
Total   $
107,994
     $
513
     $
(2,299
 )   $
106,208
  
Schedule of Unrealized Loss on Investments [Table Text Block]
    (Dollars in thousands)
    September 30, 2017
    Less than 12 months   12 Months or Greater   Total
    Number
of
Securities		   Fair
Value		   Gross
Unrealized
Losses		   Number
of
Securities		   Fair
Value		   Gross
Unrealized
Losses		   Number
of
Securities		   Fair
Value		   Gross
Unrealized
Losses
U.S. Government Agencies    
12
     $
33,733
     $
(525
 )    
9
     $
24,646
     $
(717
 )    
21
     $
58,379
     $
(1,242
 )
Obligations of States and Political Subdivisions    
22
      
11,788
      
(80
 )    
7
      
3,489
      
(42
 )    
29
      
15,277
      
(122
 )
Mortgage-Backed Securities - Government Sponsored Enterprises    
4
      
9,191
      
(45
 )    
-
      
-
      
-
      
4
      
9,191
      
(45
 )
Equity Securities - Other    
6
      
483
      
(15
 )    
-
      
-
      
-
      
6
      
483
      
(15
 )
Total    
44
     $
55,195
     $
(665
 )    
16
     $
28,135
     $
(759
 )    
60
     $
83,330
     $
(1,424
 )
                                                                         
    December 31, 2016
    Less than 12 months   12 Months or Greater   Total
    Number
of
Securities		   Fair
Value		   Gross
Unrealized
Losses		   Number
of
Securities		   Fair
Value		   Gross
Unrealized
Losses		   Number
of
Securities		   Fair
Value		   Gross
Unrealized
Losses
U.S. Government Agencies    
23
     $
62,853
     $
(1,806
 )    
-
     $
-
     $
-
      
23
     $
62,853
     $
(1,806
 )
Obligations of States and Political Subdivisions    
39
      
19,749
      
(485
 )    
1
      
260
      
(2
 )    
40
      
20,009
      
(487
 )
Equity Securities - Other    
2
      
160
      
(6
 )    
-
      
-
      
-
      
2
      
160
      
(6
 )
Total    
64
     $
82,762
     $
(2,297
 )    
1
     $
260
     $
(2
 )    
65
     $
83,022
     $
(2,299
 )
Investments Classified by Contractual Maturity Date [Table Text Block]
    (Dollars in thousands)
    September 30, 2017
    Available-for-Sale
    Amortized
Cost		   Fair
Value
Due in One Year or Less   $
2,115
     $
2,126
  
Due after One Year through Five Years    
23,469
      
23,443
  
Due after Five Years through Ten Years    
68,376
      
67,362
  
Due after Ten Years    
22,921
      
22,958
  
Total   $
116,881
     $
115,889