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Note 2 - Securities (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Available-for-sale and Held-to-maturity Reconciliation [Table Text Block]
   
March 31, 2020
  
   
Amortized Cost
    
Gross Unrealized Gains
    
Gross Unrealized (Losses)
    
Fair Value
  
Securities available for sale:
                                
U.S. agency and mortgage-backed securities   $
99,536
     $
3,093
     $
(32
 )   $
102,597
  
Obligations of states and political subdivisions    
25,561
      
514
      
(12
 )    
26,063
  
Total securities available for sale
   $
125,097
     $
3,607
     $
(44
 )   $
128,660
  
Securities held to maturity:
                                
U.S. agency and mortgage-backed securities   $
11,992
     $
315
     $
—
     $
12,307
  
Obligations of states and political subdivisions    
3,594
      
71
      
—
      
3,665
  
Corporate debt securities    
1,500
      
154
      
—
      
1,654
  
Total securities held to maturity
   $
17,086
     $
540
     $
—
     $
17,626
  
Total securities
   $
142,183
     $
4,147
     $
(44
 )   $
146,286
  
   
December 31, 2019
  
   
Amortized Cost
    
Gross Unrealized Gains
    
Gross Unrealized (Losses)
    
Fair Value
  
Securities available for sale:
                                
U.S. agency and mortgage-backed securities
   $
94,461
     $
778
     $
(334
 )   $
94,905
  
Obligations of states and political subdivisions
    
25,607
      
476
      
(5
 )    
26,078
  
Total securities available for sale
   $
120,068
     $
1,254
     $
(339
 )   $
120,983
  
Securities held to maturity:
                                
U.S. agency and mortgage-backed securities
   $
12,528
     $
6
     $
(80
 )   $
12,454
  
Obligations of states and political subdivisions
    
3,599
      
81
      
—
      
3,680
  
Corporate debt securities
    
1,500
      
12
      
—
      
1,512
  
Total securities held to maturity
   $
17,627
     $
99
     $
(80
 )   $
17,646
  
Total securities
   $
137,695
     $
1,353
     $
(419
 )   $
138,629
  
Schedule of Temporary Impairment Losses, Investments [Table Text Block]
   
March 31, 2020
  
   
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   $
7,105
     $
(23
 )   $
1,330
     $
(9
 )   $
8,435
     $
(32
 )
Obligations of states and political subdivisions    
503
      
(12
 )    
—
      
—
      
503
      
(12
 )
Total securities available for sale
   $
7,608
     $
(35
 )   $
1,330
     $
(9
 )   $
8,938
     $
(44
 )
   
December 31, 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
   $
29,853
     $
(207
 )   $
13,083
     $
(127
 )   $
42,936
     $
(334
 )
Obligations of states and political subdivisions
    
1,373
      
(5
 )    
—
      
—
      
1,373
      
(5
 )
Total securities available for sale
   $
31,226
     $
(212
 )   $
13,083
     $
(127
 )   $
44,309
     $
(339
 )
Securities held to maturity:
                                                
U.S. agency and mortgage-backed securities
   $
3,516
     $
(10
 )   $
5,936
     $
(70
 )   $
9,452
     $
(80
 )
Total securities held to maturity
   $
3,516
     $
(10
 )   $
5,936
     $
(70
 )   $
9,452
     $
(80
 )
Total securities
   $
34,742
     $
(222
 )   $
19,019
     $
(197
 )   $
53,761
     $
(419
 )
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
   $
2,155
     $
2,165
     $
436
     $
436
  
Due after one year through five years
    
9,982
      
10,265
      
4,733
      
4,820
  
Due after five years through ten years
    
34,741
      
35,983
      
3,263
      
3,471
  
Due after ten years
    
78,219
      
80,247
      
8,654
      
8,899
  
    $
125,097
     $
128,660
     $
17,086
     $
17,626
  
Marketable Securities [Table Text Block]
   
March 31, 2020
    
December 31, 2019
  
Federal Home Loan Bank stock
   $
818
     $
776
  
Federal Reserve Bank stock
    
980
      
980
  
Community Bankers’ Bank stock
    
50
      
50
  
    $
1,848
     $
1,806