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Note 13 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2018
    
2017
    
2016
  
                         
Net earnings used in the computation of basic and diluted earnings per share (in thousands)
   $
16,975
     $
15,022
     $
14,638
  
Weighted average shares outstanding - basic
    
14,937,786
      
14,510,156
      
14,082,243
  
Common stock equivalents
    
534,347
      
608,612
      
815,246
  
Total weighted average shares outstanding - diluted
    
15,472,133
      
15,118,768
      
14,897,489
  
Per Share Data:
                        
Basic
                        
Net earnings
   $
1.14
     $
1.04
     $
1.04
  
Diluted
                        
Net earnings
   $
1.10
     $
0.99
     $
0.98