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Stock Warrants (Tables)
6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Changes in Warrants
A summary of the various changes in warrants during the six-month period ended June 30, 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
 
(1,220)
 
Warrants Outstanding, June 30, 2013
 
861,901