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Note 13 - Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2015
   
2014
 
Net earnings used in the computation of basic and diluted earnings per share
  $ 13,066,000     $ 11,349,000  
Weighted average shares outstanding - basic
    13,761,009       13,298,452  
Common stock equivalents
    817,635       566,246  
Total weighted average shares outstanding - diluted
    14,578,644       13,864,698  
Per Share Data:
               
Basic
               
Net earnings
  $ 0.95     $ 0.85  
Diluted
               
Net earnings
  $ 0.90     $ 0.82