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Note 6 - Securities (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Available-for-sale Securities [Table Text Block]
(In Thousands)
                      
   
 
 
 
  
March 31, 2020
    
 
 
 
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
 
 
 
  
Unrealized
    
Unrealized
    
 
 
 
   
Amortized
    
Holding
    
Holding
    
Fair
  
 
  
Cost
    
Gains
    
Losses
    
Value
  
                                 
Obligations of U.S. Government agencies
   $
15,704
     $
704
     $
0
     $
16,408
  
Obligations of states and political subdivisions:
                                
Tax-exempt
    
78,126
      
2,982
      
(36
 )    
81,072
  
Taxable
    
35,764
      
1,348
      
(38
 )    
37,074
  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                                
Residential pass-through securities
    
54,280
      
1,472
      
0
      
55,752
  
Residential collateralized mortgage obligations
    
101,130
      
2,435
      
(9
 )    
103,556
  
Commercial mortgage-backed securities
    
45,727
      
2,846
      
(19
 )    
48,554
  
Total available-for-sale debt securities
   $
330,731
     $
11,787
     $
(102
 )   $
342,416
  
(In Thousands)
                      
   
 
 
 
  
December 31, 2019
    
 
 
 
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
 
 
 
  
Unrealized
    
Unrealized
    
 
 
 
   
Amortized
    
Holding
    
Holding
    
Fair
  
 
  
Cost
    
Gains
    
Losses
    
Value
  
                                 
Obligations of U.S. Government agencies
   $
16,380
     $
620
     $
0
     $
17,000
  
Obligations of states and political subdivisions:
                                
Tax-exempt
    
68,787
      
2,011
      
(38
 )    
70,760
  
Taxable
    
35,446
      
927
      
(70
 )    
36,303
  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored
                                
agencies:
                                
Residential pass-through securities
    
58,875
      
472
      
(137
 )    
59,210
  
Residential collateralized mortgage obligations
    
115,025
      
308
      
(610
 )    
114,723
  
Commercial mortgage-backed securities
    
47,765
      
1,069
      
(107
 )    
48,727
  
Total available-for-sale debt securities
   $
342,278
     $
5,407
     $
(962
 )   $
346,723
  
Schedule of Unrealized Loss on Investments [Table Text Block]
 
  
Less Than 12 Months
    
12 Months or More
    
Total
  
 
  
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
   
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
                                                 
Obligations of states and political subdivisions:
                                                
Tax-exempt
   $
2,968
     $
(36
 )   $
0
     $
0
     $
2,968
     $
(36
 )
Taxable
    
1,270
      
(38
 )    
0
      
0
      
1,270
      
(38
 )
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                                                
Residential collateralized mortgage obligations
    
875
      
(9
 )    
0
      
0
      
875
      
(9
 )
Commercial mortgage-backed securities
    
3,613
      
(19
 )    
0
      
0
      
3,613
      
(19
 )
Total temporary impaired available-for-sale debt securities
   $
8,726
     $
(102
 )   $
0
     $
0
     $
8,726
     $
(102
 )
 
  
Less Than 12 Months
    
12 Months or More
    
Total
  
 
  
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
   
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
                                                 
Obligations of states and political subdivisions:
                                                
Tax-exempt
   $
6,429
     $
(38
 )   $
0
     $
0
     $
6,429
     $
(38
 )
Taxable
    
5,624
      
(68
 )    
161
      
(2
 )    
5,785
      
(70
 )
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                                                
Residential pass-through securities
    
9,771
      
(35
 )    
14,787
      
(102
 )    
24,558
      
(137
 )
Residential collateralized mortgage obligations
    
31,409
      
(195
 )    
30,535
      
(415
 )    
61,944
      
(610
 )
Commercial mortgage-backed securities
    
0
      
0
      
8,507
      
(107
 )    
8,507
      
(107
 )
Total temporarily impaired available-for-sale debt securities
   $
53,233
     $
(336
 )   $
53,990
     $
(626
 )   $
107,223
     $
(962
 )
Realized Gain (Loss) on Investments [Table Text Block]
(In Thousands)
     
 
  
3 Months Ended
  
   
March 31,
    
March 31,
  
   
2020
    
2019
  
Gross realized gains from sales
   $
52
     $
0
  
Gross realized losses from sales
    
(52
 )    
0
  
Net realized gains
   $
0
     $
0
  
Investments Classified by Contractual Maturity Date [Table Text Block]
(In Thousands)
      
   
March 31, 2020
  
   
Amortized
    
Fair
  
 
  
Cost
    
Value
  
                 
Due in one year or less
   $
6,611
     $
6,644
  
Due from one year through five years
    
33,945
      
34,945
  
Due from five years through ten years
    
43,596
      
45,168
  
Due after ten years
    
45,442
      
47,797
  
Sub-total
    
129,594
      
134,554
  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                
Residential pass-through securities
    
54,280
      
55,752
  
Residential collateralized mortgage obligations
    
101,130
      
103,556
  
Commercial mortgage-backed securities
    
45,727
      
48,554
  
Total
   $
330,731
     $
342,416