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Net Income Per Share (Tables)
3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block]
Actual weighted-average Common Shares outstanding used in calculating basic and diluted net income per share were as follows:

 

Three months ended March 31   2013     2012  
             
Basic weighted-average shares outstanding     26,601,282       26,220,313  
Effect of dilutive shares     793,759       636,561  
Diluted weighted-average shares outstanding     27,395,041       26,856,874