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Note 13 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
     
Years Ended December 31,
  
   
2019
    
2018
    
2017
  
Net earnings used in the computation of basic and diluted earnings per share (in thousands)
   $
12,066
     $
16,975
     $
15,022
  
                         
Weighted average shares outstanding - basic
    
14,945,165
      
14,937,786
      
14,510,156
  
Dilutive common stock equivalents
    
321,243
      
534,347
      
608,612
  
Total weighted average shares outstanding - diluted
    
15,266,408
      
15,472,133
      
15,118,768
  
Net income per share:
                        
Basic
   $
0.81
     $
1.14
     $
1.04
  
Diluted
   $
0.79
     $
1.10
     $
0.99