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Note 4 - Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block]
   
Available-for-Sale
  
   
June 30
, 2019
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
64,271
     $
330
     $
(334
)
   $
64,267
  
Commercial
    
49,306
      
46
      
(603
)
    
48,749
  
Obligations of states and political subdivisions
    
4,754
      
111
      
—
 
    
4,865
  
U.S. Treasury securities
    
79
      
1
      
—
      
80
  
Total
   $
118,410
     $
488
     $
(937
)
   $
117,961
  
   
Held-to-Maturity
  
   
June 30
, 2019
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
10,483
     $
—
     $
(86
)
   $
10,397
  
Obligations of U.S. government-sponsored agencies
    
6,548
      
—
      
(40
)
    
6,508
  
Obligations of states and political subdivisions
    
1,657
      
13
      
(1
)
    
1,669
  
Total
   $
18,688
     $
13
     $
(127
)
   $
18,574
  
   
Available-for-Sale
  
   
December 31, 2018
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
73,859
     $
113
     $
(1,517
)
   $
72,455
  
Commercial
    
56,101
      
10
      
(1,822
 )    
54,289
  
Obligations of states and political subdivisions
    
5,617
      
51
      
(4
 )    
5,664
  
U.S. Treasury securities
    
79
      
—
      
—
      
79
  
Total
   $
135,656
     $
174
     $
(3,343
)
   $
132,487
  
   
Held-to-Maturity
  
   
December 31, 2018
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
11,716
     $
—
     $
(349
)
   $
11,367
  
Obligations of U.S. government-sponsored agencies
    
8,026
      
—
      
(244
)
    
7,782
  
Obligations of states and political subdivisions
    
1,720
      
—
      
(17
)
    
1,703
  
Total
   $
21,462
     $
—
     $
(610
)
   $
20,852
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Available-for-Sale
    
Held-to-Maturity
  
   
Amortized
Cost
    
Estimated
Fair
Value
    
Amortized
Cost
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Maturing within one year
   $
259
     $
261
     $
122
     $
122
  
Maturing after one to five years
    
34,821
      
34,766
      
3,397
      
3,400
  
Maturing after five to ten years
    
47,803
      
47,686
      
6,176
      
6,113
  
Maturing after ten years
    
35,527
      
35,248
      
8,993
      
8,939
  
Total
   $
118,410
     $
117,961
     $
18,688
     $
18,574
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Available-for-Sale
  
   
June 30
, 2019
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
180
     $
—
 
   $
40,760
     $
(334
)
Commercial
    
2
      
—
 
    
41,114
      
(603
)
U.S. Treasury securities
    
80
      
—
      
—
      
—
  
Total
   $
262
     $
—
 
   $
81,874
     $
(937
)
   
Held-to-Maturity
  
   
June 30
, 2019
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:                                
Commercial
   $
—
     $
—
     $
10,397
     $
(86
 )
Obligations of U.S. government-sponsored agencies    
—
      
—
      
6,386
      
(40
 )
Obligations of states and political subdivisions
    
—
      
—
      
508
      
(1
 )
Total
   $
—
     $
—
     $
17,291
     $
(127
)
   
Available-for-Sale
  
   
December 31, 2018
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
9,417
     $
(87
)
   $
53,507
     $
(1,430
)
Commercial
    
461
      
(3
)
    
53,430
      
(1,819
)
Obligations of states and political subdivisions
    
879
      
(2
)
    
420
      
(2
 )
U.S. Treasury securities
    
79
      
—
      
—
      
—
  
Total
   $
10,836
     $
(92
)
   $
107,357
     $
(3,251
)
   
Held-to-Maturity
  
   
December 31, 2018
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
—
     $
—
     $
11,367
     $
(349
 )
Obligations of U.S. government-sponsored agencies
    
—
      
—
      
7,782
      
(244
)
Obligations of states and political subdivisions
    
770
      
—
      
933
      
(17
 )
Total
   $
770
     $
—
     $
20,082
     $
(610
)