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Note 2 - Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Available-for-sale and Held-to-maturity Reconciliation [Table Text Block]
   
September 30, 2019
  
   
Amortized Cost
    
Gross Unrealized Gains
    
Gross Unrealized (Losses)
    
Fair Value
  
Securities available for sale:
                                
U.S. agency and mortgage-backed securities   $
87,004
     $
1,112
     $
(184
 )   $
87,932
  
Obligations of states and political subdivisions    
26,118
      
519
      
(1
 )    
26,636
  
Total securities available for sale
   $
113,122
     $
1,631
     $
(185
 )   $
114,568
  
Securities held to maturity:
                                
U.S. agency and mortgage-backed securities   $
13,119
     $
21
     $
(71
 )   $
13,069
  
Obligations of states and political subdivisions    
3,603
      
67
      
—
      
3,670
  
Corporate debt securities    
1,500
      
20
      
—
      
1,520
  
Total securities held to maturity
   $
18,222
     $
108
     $
(71
 )   $
18,259
  
Total securities
   $
131,344
     $
1,739
     $
(256
 )   $
132,827
  
   
December 31, 2018
  
   
Amortized Cost
    
Gross Unrealized Gains
    
Gross Unrealized (Losses)
    
Fair Value
  
Securities available for sale:
                                
U.S. agency and mortgage-backed securities
   $
86,944
     $
44
     $
(2,066
 )   $
84,922
  
Obligations of states and political subdivisions
    
15,203
      
31
      
(299
 )    
14,935
  
Total securities available for sale
   $
102,147
     $
75
     $
(2,365
 )   $
99,857
  
Securities held to maturity:
                                
U.S. agency and mortgage-backed securities
   $
27,420
     $
—
     $
(869
 )   $
26,551
  
Obligations of states and political subdivisions
    
14,488
      
20
      
(174
 )    
14,334
  
Corporate debt securities
    
1,500
      
9
      
—
      
1,509
  
Total securities held to maturity
   $
43,408
     $
29
     $
(1,043
 )   $
42,394
  
Total securities
   $
145,555
     $
104
     $
(3,408
 )   $
142,251
  
Schedule of Temporary Impairment Losses, Investments [Table Text Block]
   
September 30, 2019
  
   
Less than 12 months
    
12 months or more
    
Total
  
   
Fair Value
    
Unrealized (Loss)
    
Fair Value
    
Unrealized (Loss)
    
Fair Value
    
Unrealized (Loss)
  
Securities available for sale:
                                                
U.S. agency and mortgage-backed securities   $
13,786
     $
(45
 )   $
14,185
     $
(139
 )   $
27,971
     $
(184
 )
Obligations of states and political subdivisions    
230
      
(1
 )    
—
      
—
      
230
      
(1
 )
Total securities available for sale
   $
14,016
     $
(46
 )   $
14,185
     $
(139
 )   $
28,201
     $
(185
 )
Securities held to maturity:
                                                
U.S. agency and mortgage-backed securities   $
—
     $
—
     $
7,692
     $
(71
 )   $
7,692
     $
(71
 )
Total securities held to maturity
   $
—
     $
—
     $
7,692
     $
(71
 )   $
7,692
     $
(71
 )
Total securities
   $
14,016
     $
(46
 )   $
21,877
     $
(210
 )   $
35,893
     $
(256
 )
   
December 31, 2018
  
   
Less than 12 months
    
12 months or more
    
Total
  
   
Fair Value
    
Unrealized (Loss)
    
Fair Value
    
Unrealized (Loss)
    
Fair Value
    
Unrealized (Loss)
  
Securities available for sale:
                                                
U.S. agency and mortgage-backed securities
   $
26,350
     $
(215
 )   $
49,652
     $
(1,851
 )   $
76,002
     $
(2,066
 )
Obligations of states and political subdivisions
    
3,761
      
(25
 )    
5,127
      
(274
 )    
8,888
      
(299
 )
Total securities available for sale
   $
30,111
     $
(240
 )   $
54,779
     $
(2,125
 )   $
84,890
     $
(2,365
 )
Securities held to maturity:
                                                
U.S. agency and mortgage-backed securities
   $
—
     $
—
     $
26,551
     $
(869
 )   $
26,551
     $
(869
 )
Obligations of states and political subdivisions
    
5,326
      
(37
 )    
6,115
      
(137
 )    
11,441
      
(174
 )
Total securities held to maturity
   $
5,326
     $
(37
 )   $
32,666
     $
(1,006
 )   $
37,992
     $
(1,043
 )
Total securities
   $
35,437
     $
(277
 )   $
87,445
     $
(3,131
 )   $
122,882
     $
(3,408
 )
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Available for Sale
    
Held to Maturity
  
   
Amortized Cost
    
Fair Value
    
Amortized Cost
    
Fair Value
  
Due within one year
   $
2,034
     $
2,042
     $
437
     $
437
  
Due after one year through five years
    
7,732
      
7,768
      
4,741
      
4,795
  
Due after five years through ten years
    
29,875
      
30,591
      
3,415
      
3,445
  
Due after ten years
    
73,481
      
74,167
      
9,629
      
9,582
  
    $
113,122
     $
114,568
     $
18,222
     $
18,259
  
Marketable Securities [Table Text Block]
   
September 30, 2019
    
December 31, 2018
  
Federal Home Loan Bank stock
   $
776
     $
763
  
Federal Reserve Bank stock
    
980
      
875
  
Community Bankers’ Bank stock
    
50
      
50
  
    $
1,806
     $
1,688