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Note 7 - Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2018
    
2017
    
2018
    
2017
  
Net earnings used in the computation of basic and diluted earnings per share (in thousands)
   $
6,122
     $
4,962
     $
12,389
     $
13,138
  
                                 
Weighted average shares outstanding - basic
    
15,010,660
      
14,573,813
      
14,929,513
      
14,475,311
  
Common stock equivalents
    
489,234
      
655,909
      
576,129
      
591,305
  
Weighted average shares outstanding - diluted
    
15,499,894
      
15,229,722
      
15,505,642
      
15,066,616
  
Per Share Data:
                                
Basic
                                
Net earnings
   $
0.41
     $
0.34
     $
0.83
     $
0.91
  
Diluted
                                
Net earnings
   $
0.39
     $
0.33
     $
0.80
     $
0.87