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Note 7 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Net earnings used in the computation of basic and diluted earnings per share (in thousands)
   $
3,817
     $
4,341
     $
6,267
     $
8,176
  
                                 
Weighted average shares outstanding - basic
    
14,956,221
      
14,501,399
      
14,888,940
      
14,426,060
  
Common stock equivalents
    
603,183
      
539,032
      
619,577
      
559,003
  
Weighted average shares outstanding - diluted
    
15,559,404
      
15,040,431
      
15,508,517
      
14,985,063
  
Per Share Data:
                                
Basic
                                
Net earnings
   $
0.26
     $
0.30
     $
0.42
     $
0.57
  
Diluted
                                
Net earnings
   $
0.25
     $
0.29
     $
0.40
     $
0.55