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Note 3 - Securities (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Available-for-sale Securities [Table Text Block]
(dollars in thousands)
  
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Fair Value
  
                                 
Available-for-sale securities:
                                
U.S. agencies
   $
44,474
     $
135
     $
(503
 )   $
44,106
  
Collateralized mortgage obligations
    
2,071
      
0
      
(59
 )    
2,012
  
Municipalities
    
92,257
      
1,404
      
(424
 )    
93,237
  
SBA pools
    
8,707
      
13
      
(47
 )    
8,673
  
Corporate debt
    
21,426
      
62
      
(901
 )    
20,587
  
Asset backed securities
    
38,395
      
119
      
(417
 )    
38,097
  
    $
207,330
     $
1,733
     $
(2,351
 )   $
206,712
  
(dollars in thousands)
  
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Fair Value
  
                                 
Available-for-sale securities:
                                
U.S. agencies
   $
29,741
     $
374
     $
(143
 )   $
29,972
  
Collateralized mortgage obligations
    
2,628
      
1
      
(36
 )    
2,593
  
Municipalities
    
91,201
      
2,174
      
(308
 )    
93,067
  
SBA pools
    
11,818
      
46
      
(14
 )    
11,850
  
Corporate debt
    
19,358
      
112
      
(681
 )    
18,789
  
Asset backed securities
    
22,866
      
125
      
(14
 )    
22,977
  
    $
177,612
     $
2,832
     $
(1,196
 )   $
179,248
  
Schedule of Unrealized Loss on Investments [Table Text Block]
(dollars in thousands)
  
Less than 12 months
    
12 months or more
    
Total
  
Description of Securities
  
Fair
Value
    
Unrealized Loss
    
Fair
Value
    
Unrealized Loss
    
Fair
Value
    
Unrealized Loss
  
U.S. agencies
   $
22,007
     $
(230
 )   $
11,972
     $
(273
 )   $
33,979
     $
(503
 )
Collateralized mortgage obligations
    
93
      
(1
 )    
1,917
      
(60
 )    
2,010
      
(61
 )
Municipalities
    
9,630
      
(55
 )    
26,559
      
(367
 )    
36,189
      
(422
 )
SBA pools
    
3,284
      
(8
 )    
3,726
      
(40
 )    
7,010
      
(48
 )
Corporate debt
    
3,999
      
(59
 )    
11,645
      
(842
 )    
15,644
      
(901
 )
Asset backed securities
    
23,604
      
(412
 )    
1,853
      
(4
 )    
25,457
      
(416
 )
Total temporarily impaired securities
   $
62,617
     $
(765
 )   $
57,672
     $
(1,586
 )   $
120,289
     $
(2,351
 )
(dollars in thousands)
  
Less than 12 months
    
12 months or more
    
Total
  
Description of Securities
  
Fair Value
    
Unrealized
Loss
    
Fair Value
    
Unrealized
Loss
    
Fair Value
    
Unrealized
Loss
  
U.S. agencies
   $
10,588
     $
(46
 )   $
5,437
     $
(97
 )   $
16,025
     $
(143
 )
Collateralized mortgage obligations
    
1,090
      
(11
 )    
921
      
(26
 )    
2,011
      
(37
 )
Municipalities
    
28,779
      
(236
 )    
5,611
      
(72
 )    
34,390
      
(308
 )
SBA pools
    
1,998
      
(4
 )    
703
      
(9
 )    
2,701
      
(13
 )
Corporate debt
    
1,994
      
(6
 )    
13,815
      
(675
 )    
15,809
      
(681
 )
Asset backed securities
    
6,154
      
(13
 )    
333
      
(1
 )    
6,487
      
(14
 )
Total temporarily impaired securities
   $
50,603
     $
(316
 )   $
26,820
     $
(880
 )   $
77,423
     $
(1,196
 )
Investments Classified by Contractual Maturity Date [Table Text Block]
(dollars in thousands)
  
Amortized
    
Fair
  
   
Cost
    
Value
  
Available-for-sale securities:
                
Due in one year or less
   $
36,972
     $
36,940
  
Due after one year through five years
    
55,017
      
55,259
  
Due after five years through ten years
    
46,406
      
46,084
  
Due after ten years
    
68,935
      
68,429
  
    $
207,330
     $
206,712