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Note 4 - Securities Available for Sale (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Available-for-sale Securities [Table Text Block]
 
(Dollars in thousands)
  
Amortized Cost
    
Gross Unrealized Gains
    
Gross Unrealized Losses
    
Fair Value
  
December 31, 20
20
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Mortgage-backed securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Federal National Mortgage Association (FNMA)
  
$
68,699
    
 
1,313
    
 
(3
)
  
 
70,009
  
Federal Home Loan Mortgage Corporation (FHLMC)
  
 
31,025
    
 
327
    
 
0
    
 
31,352
  
Collateralized mortgage obligations:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
FNMA
  
 
97
    
 
6
    
 
0
    
 
103
  
   
 
99,821
    
 
1,646
    
 
(3
)
  
 
101,464
  
Other marketable securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. Government agency obligations
  
 
45,029
    
 
204
    
 
0
    
 
45,233
  
Municipal obligations
  
 
725
    
 
1
    
 
0
    
 
726
  
Corporate obligations
  
 
37
    
 
0
    
 
0
    
 
37
  
Corporate preferred stock
  
 
700
    
 
0
    
 
(70
)
  
 
630
  
   
 
46,491
    
 
205
    
 
(70
)
  
 
46,626
  
   
$
146,312
    
 
1,851
    
 
(73
)
  
 
148,090
  
                                 
December 31, 201
9
                                
Mortgage-backed securities:
                                
FNMA
   $
46,604
      
47
      
(65
 )    
46,586
  
FHLMC
    
8,004
      
88
      
0
      
8,092
  
Collateralized mortgage obligations:
                                
FNMA
    
169
      
4
      
0
      
173
  
     
54,777
      
139
      
(65
 )    
54,851
  
Other marketable securities:
                                
U.S. Government agency obligations
    
49,974
      
39
      
(21
 )    
49,992
  
Municipal obligations
    
1,969
      
7
      
0
      
1,976
  
Corporate obligations
    
108
      
0
      
0
      
108
  
Corporate preferred stock
    
700
      
0
      
(35
 )    
665
  
     
52,751
      
46
      
(56
 )    
52,741
  
    $
107,528
      
185
      
(121
 )    
107,592
  
                                 
Contractual Obligation, Fiscal Year Maturity [Table Text Block]
   
Payments Due by Period
  
(Dollars in thousands)
  
Total
    
Less than 1 Year
    
1-3 Years
    
4-5 Years
    
More than 5 Years
  
Contractual Obligations:
                                        
Annual rental commitments under non-cancellable operating leases
   $
3,379
      
896
      
1,739
      
744
      
0
  
Total contractual obligations
   $
3,379
      
896
      
1,739
      
744
      
0
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Less Than Twelve Months
    
Twelve Months or More
    
Total
  
(Dollars in thousands)
  
# of Investments
    
Fair
Value
    
Unrealized Losses
    
# of Investments
    
Fair Value
    
Unrealized Losses
    
Fair
Value
    
Unrealized Losses
  
December 31, 2020
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Mortgage backed securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
FNMA
  
 
1
    
$
4,956
    
 
(3
)
  
 
0
    
$
0
    
 
0
    
$
4,956
    
 
(3
)
Other marketable securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Corporate preferred stock
  
 
0
    
 
0
    
 
0
    
 
1
    
 
630
    
 
(70
)
  
 
630
    
 
(70
)
Total temporarily impaired securities
  
 
1
    
$
4,956
    
 
(3
)
  
 
1
    
$
630
    
 
(70
)
  
$
5,586
    
 
(73
)
                                                                 
December 31, 2019
                                                                
Mortgage backed securities:
                                                                
FNMA
    
4
     $
12,143
      
(65
 )    
0
     $
0
      
0
     $
12,143
      
(65
 )
Other marketable securities:
                                                                
U.S. Government agency obligations
    
0
      
0
      
0
      
4
      
19,972
      
(21
 )    
19,972
      
(21
 )
Corporate preferred stock
    
0
      
0
      
0
      
1
      
665
      
(35
 )    
665
      
(35
 )
Total temporarily impaired securities
    
4
     $
12,143
      
(65
 )    
5
     $
20,637
      
(56
 )   $
32,780
      
(121
 )
                                                                 
Available-for-sale Securities [Member]  
Notes Tables  
Contractual Obligation, Fiscal Year Maturity [Table Text Block]
(Dollars in thousands)
  
Amortized Cost
    
Fair
Value
  
Due one year or less
   $
71,923
      
72,677
  
Due after one year through five years
    
64,016
      
64,951
  
Due after five years through ten years
    
9,558
      
9,715
  
Due after ten years
    
815
      
747
  
Total
   $
146,312
      
148,090