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Common Shares (Summary Of Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of options, beginning of period (in shares) 2,257,500 2,882,500  
Granted, Number of options (in shares)   175,000  
Number of options, Cancelled/Forfeited (in shares)   (125,000)  
Number of options, Expired (in shares)   (675,000)  
Number of options, end of period (in shares) 2,257,500 2,257,500 2,882,500
Number of options, Exercisable (in shares) 2,011,250    
Weighted average exercise price per option, beginning of period (in dollars per share) $ 1.60 $ 1.79  
Weighted average exercise price per option, Granted (in dollars per share)   0.52  
Weighted average exercise price per option, Cancelled/Forfeited (in dollars per share)   3.16  
Weighted average exercise price per option, Expired (in dollars per share)   1.85  
Weighted average exercise price per option, end of period (in dollars per share) 1.60 $ 1.60 $ 1.79
Weighted average exercise price, Exercisable (in dollars per share) $ 1.75    
Weighted average remaining contractual term, Outstanding 2 years 7 days 3 years 7 days 3 years 26 days
Weighted average remaining contractual term, Exercisable 1 year 10 months 28 days    
Aggregate intrinsic value, Outstanding, end of period (in dollars)     $ 54
Employee, Directors and Consultants Stock Options [Member]      
Granted, Number of options (in shares) 0