Quarterly report pursuant to Section 13 or 15(d)

Common Stock (Details)

v2.4.0.8
Common Stock (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Summary of stock options activity    
Number of Optioned Common Shares, Beginning Balance 804,781  
Weighted Average Exercise Price, Beginning Balance $ 11.34  
Number of Optioned Common Shares, Option grants 209,282  
Weighted Average Exercise Price, Option grants $ 11.81  
Number of Optioned Common Shares, Option expirations (3,061)  
Weighted Average Exercise Price, Option expirations $ 4.11  
Number of Optioned Common Shares, Option exercises (3,475) (33,938)
Weighted Average Exercise Price, Option exercises $ 3.00  
Number of Optioned Common Shares, Option forfeitures (7,300)  
Weighted Average Exercise Price, Option forfeitures $ 12.23  
Number of Optioned Common Shares, Ending Balance 1,000,227  
Weighted Average Exercise Price, Ending Balance $ 11.48