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Stock Warrants (Tables)
3 Months Ended
Mar. 31, 2013
Stockholders' Equity Note [Abstract]  
Changes in Warrants

A summary of the various changes in warrants during the three-month period ended March 31, 2013 is as follows.

 

    Number of
Shares
 
       
Warrants Outstanding at December 31, 2012     656,641  
Exercised During the Period      
Issued During the Period     206,480  
Expired During the Period      
         
Warrants Outstanding, March 31, 2013     863,121