Note 21 - Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Quarterly Financial Information [Table Text Block]
(In thousands, except per share data)
                                
Quarters Ended 2016
  
March 31
   
June 30
   
Sept. 30
   
Dec. 31
 
Interest income
   $
15,330
 
   $
14,973
     $
14,619
 
   $
14,449
  
Interest expense
    
2,043
 
    
1,975
      
1,809
 
    
928
  
Net interest income
    
13,287
 
    
12,998
      
12,810
 
    
13,521
  
Provision for loan losses
    
(473
)
    
(156
 )    
(190
)
    
175
  
Net interest income after provision for loan losses
    
13,760
 
    
13,154
      
13,000
 
    
13,346
  
Noninterest income
    
9,542
1
 		    
5,521
      
10,772
2
 		    
5,351
  
Noninterest expense
    
14,407
 
    
13,884
      
17,888
2
    
15,221
  
Income before income taxes
    
8,895
 
    
4,791
      
5,884
 
    
3,476
  
Income tax expense
    
2,715
 
    
1,235
      
1,560
 
    
931
  
Net income
    
6,180
 
    
3,556
      
4,324
 
    
2,545
  
Less preferred stock dividends and discount accretion
    
-
 
    
-
      
-
 
    
-
  
Net income available to common shareholders
   $
6,180
 
   $
3,556
     $
4,324
 
   $
2,545
  
Net income per common share, basic and diluted
   $
.82
 
   $
.47
     $
.58
 
   $
.34
  
Weighted average common shares outstanding, basic and diluted
    
7,500
 
    
7,502
      
7,505
 
    
7,508
  
(In thousands, except per share data)
                                
Quarters Ended 2015
  
March 31
   
June 30
   
Sept. 30
   
Dec. 31
 
Interest income
   $
15,220
     $
15,721
     $
15,123
     $
15,172
  
Interest expense
    
2,217
      
2,148
      
2,158
      
2,118
  
Net interest income
    
13,003
      
13,573
      
12,965
      
13,054
  
Provision for loan losses
    
(1,545
 )    
(264
 )    
(898
 )    
(722
 )
Net interest income after provision for loan losses
    
14,548
      
13,837
      
13,863
      
13,776
  
Noninterest income
    
5,441
      
5,508
      
5,689
      
5,573
  
Noninterest expense
    
14,510
      
14,474
      
14,281
      
14,685
  
Income before income taxes
    
5,479
      
4,871
      
5,271
      
4,664
  
Income tax expense
    
1,405
      
1,369
      
1,439
      
1,080
  
Net income
    
4,074
      
3,502
      
3,832
      
3,584
  
Less preferred stock dividends and discount accretion
    
225
      
170
      
-
      
-
  
Net income available to common shareholders
   $
3,849
     $
3,332
     $
3,832
     $
3,584
  
Net income per common share, basic and diluted
   $
.51
     $
.44
     $
.51
     $
.48
  
Weighted average common shares outstanding, basic and diluted
    
7,490
      
7,492
      
7,495
      
7,497