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Note 2 - Earnings Per Share
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Earnings Per Share [Text Block]
2.
EARNINGS PER SHARE
 
There are no convertible securities that would affect the numerator in calculating basic and diluted earnings per share; therefore, net income as presented on the Consolidated Statement of Income will be used as the numerator. The following table sets forth the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computation for the year ended
December
31.
 
   
2016
    
2015
    
2014
  
Weighted-average common shares
outstanding
    
2,494,022
     
2,251,365
     
2,231,165
 
                         
Average treasury stock shares
    
(386,165
 )    
(236,399
 )    
(189,530
 )
                         
Weighted-average common shares and
common stock equivalents used to
calculate basic earnings per share
    
2,107,857
     
2,014,966
     
2,041,635
 
                         
Additional common stock equivalents
used to calculate diluted
earnings per share
    
11,357
     
9,154
     
7,871
 
                         
Weighted-average common shares and
common stock equivalents used to
calculate diluted earnings per share
    
2,119,214
     
2,024,120
     
2,049,506
 
 
Options to purchase
29,324
shares of common stock at prices ranging from
$17.55
to
$37.48
were outstanding during the year ended
December
31,
2016.
Of those options,
29,324
were considered dilutive based on the average market price exceeding the strike price for the year ended
December
31,
2016.
  The remaining options had no dilutive effect on the earnings per share.
 
Options to purchase
31,949
shares of common stock at prices ranging from
$17.55
to
$40.24
were outstanding during the year ended
December
31,
2015.
Of those options,
27,250
were considered dilutive based on the average market price exceeding the strike price for the year ended
December
31,
2015.
  The remaining options had no dilutive effect on the earnings per share.
 
Options to purchase
46,451
shares of common stock at prices ranging from
$17.55
to
$40.24
were outstanding during the year ended
December
31,
2014.
Of those options,
28,282
were considered dilutive based on the average market price exceeding the strike price for the year ended
December
31,
2014.
  The remaining options had no dilutive effect on the earnings per share.