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Summary of stock option activity (Details)
No. Of shares
Weighted-Average exercise price
Weighted-Average Remaining Contractual term (Years)
Aggregate Intrinsic value
Outstanding options at Dec. 31, 2011 310,000 3.03    
Forfeited (50,000) 2.54    
Expired (235,000) 3.19    
Exercisable at December 31, 2012 at Dec. 31, 2012 25,000 2.54 0.4 0
Outstanding options. at Dec. 31, 2012 25,000 2.54 0.4 0