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Note 13 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
201
7
    
201
6
    
201
5
  
                         
Net earnings used in the computation of basic an
d
diluted earnings per share (in thousands
)
   $
15,022
     $
14,638
     $
13,066
  
Weighted average share
s
outstanding - basi
c
    
14,510,156
      
14,082,243
      
13,761,009
  
Common stock equivalent
s
    
608,612
      
815,246
      
817,635
  
Total weighted average share
s
outstanding - diluted
   
15,118,768
      
14,897,489
      
14,578,644
  
Per Share Data
:
                        
Basi
c
                        
Net earning
s
   $
1.04
     $
1.04
     $
0.95
  
Dilute
d
                        
Net earning
s
   $
0.99
     $
0.98
     $
0.90