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Net Income Per Share: (Tables)
 3 Months Ended
Mar. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table presents the calculation of net earnings per common share (“EPS”) — basic and diluted.
 
 
Three months ended March 31,
 
2014
 
2013
Net income
$
6,657

 
$
8,685

Weighted average number of common shares outstanding (for basic calculation)
15,097

 
14,507

Dilutive securities
298

 
546

Weighted average common and common equivalent shares outstanding (for diluted calculation)
15,395

 
15,053

EPS — basic
$
0.44

 
$
0.60

EPS — diluted
$
0.43

 
$
0.58