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Note 7 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended March 31,
  
   
2017
    
2016
  
Net earnings used in the computation of
basic and diluted earnings per share
   $
3,835,000
    $
2,442,000
 
                 
Weighted average shares outstanding - basic
    
14,350,721
     
13,927,063
 
Common stock equivalents
    
578,974
     
741,595
 
Weighted average shares outstanding - diluted
   
14,929,695
     
14,668,658
 
Per Share Data:
                
Basic
                
Net earnings
   $
0.27
    $
0.18
 
Diluted
                
Net earnings
   $
0.26
    $
0.17