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Note 2 - Securities (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Available-for-sale and Held-to-maturity Reconciliation [Table Text Block]
   
March 31, 2021
  
   
Amortized Cost
    
Gross Unrealized Gains
    
Gross Unrealized (Losses)
    
Fair Value
  
Securities available for sale:
                                
U.S. agency and mortgage-backed securities   $
107,951
     $
2,183
     $
(795
 )   $
109,339
  
Obligations of states and political subdivisions    
50,015
      
831
      
(443
 )    
50,403
  
Total securities available for sale
   $
157,966
     $
3,014
     $
(1,238
 )   $
159,742
  
Securities held to maturity:
                                
U.S. agency and mortgage-backed securities   $
8,781
     $
212
     $
—
     $
8,993
  
Obligations of states and political subdivisions    
3,143
      
116
      
—
      
3,259
  
Corporate debt securities    
1,500
      
91
      
—
      
1,591
  
Total securities held to maturity
   $
13,424
     $
419
     $
—
     $
13,843
  
Total securities
   $
171,390
     $
3,433
     $
(1,238
 )   $
173,585
  
   
December 31, 2020
  
   
Amortized Cost
    
Gross Unrealized Gains
    
Gross Unrealized (Losses)
    
Fair Value
  
Securities available for sale:
                                
U.S. agency and mortgage-backed securities
   $
98,848
     $
2,830
     $
(80
 )   $
101,598
  
Obligations of states and political subdivisions
    
37,507
      
1,122
      
(2
 )    
38,627
  
Total securities available for sale
   $
136,355
     $
3,952
     $
(82
 )   $
140,225
  
Securities held to maturity:
                                
U.S. agency and mortgage-backed securities
   $
9,588
     $
264
     $
—
     $
9,852
  
Obligations of states and political subdivisions
    
3,146
      
140
      
—
      
3,286
  
Corporate debt securities
    
1,500
      
105
      
—
      
1,605
  
Total securities held to maturity
   $
14,234
     $
509
     $
—
     $
14,743
  
Total securities
   $
150,589
     $
4,461
     $
(82
 )   $
154,968
  
Schedule of Temporary Impairment Losses, Investments [Table Text Block]
   
March 31, 2021
  
   
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   $
37,512
     $
(795
 )   $
—
     $
—
     $
37,512
     $
(795
 )
Obligations of states and political subdivisions    
21,599
      
(443
 )    
—
      
—
      
21,599
      
(443
 )
Total securities available for sale
   $
59,111
     $
(1,238
 )   $
—
     $
—
     $
59,111
     $
(1,238
 )
   
December 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
   $
17,367
     $
(80
 )   $
—
     $
—
     $
17,367
     $
(80
 )
Obligations of states and political subdivisions
    
1,020
      
(2
 )    
—
      
—
      
1,020
      
(2
 )
Total securities available for sale
   $
18,387
     $
(82
 )   $
—
     $
—
     $
18,387
     $
(82
 )
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
   $
2,345
     $
2,378
     $
391
     $
392
  
Due after one year through five years
    
8,892
      
9,192
      
6,040
      
6,251
  
Due after five years through ten years
    
44,696
      
45,378
      
2,107
      
2,176
  
Due after ten years
    
102,033
      
102,794
      
4,886
      
5,024
  
    $
157,966
     $
159,742
     $
13,424
     $
13,843
  
Marketable Securities [Table Text Block]
   
March 31, 2021
    
December 31, 2020
  
Federal Home Loan Bank stock
   $
573
     $
818
  
Federal Reserve Bank stock
    
981
      
980
  
Community Bankers' Bank stock
    
77
      
77
  
    $
1,631
     $
1,875