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Common Shares (Summary Of Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Capital Stock [Abstract]        
Number of options, beginning of period (in shares) 2,257,500 2,257,500 2,882,500  
Granted, Number of options (in shares) 50,000   175,000  
Number of options, Cancelled/Forfeited (in shares)     (125,000)  
Number of options, Exercised (in shares) (65,500)      
Number of options, Expired (in shares) (697,500)   (675,000)  
Number of options, end of period (in shares) 1,544,500 2,257,500 2,257,500 2,882,500
Number of options, Exercisable (in shares) 1,248,250      
Weighted average exercise price per option, beginning of period (in dollars per share) $ 1.60 $ 1.60 $ 1.79  
Weighted average exercise price per option, Granted (in dollars per share) 1.11   0.52  
Weighted average exercise price per option, Cancelled/Forfeited (in dollars per share)     3.16  
Weighted average exercise price per option, Exercised (in dollars per share) 0.39      
Weighted average exercise price per option, Expired (in dollars per share) 2.91   1.85  
Weighted average exercise price per option, end of period (in dollars per share) 1.05 $ 1.60 $ 1.60 $ 1.79
Weighted average exercise price, Exercisable (in dollars per share) $ 1.18      
Weighted average remaining contractual term, Outstanding 1 year 9 months 15 days 2 years 7 days 3 years 7 days 3 years 26 days
Weighted average remaining contractual term, Exercisable 1 year 7 months 21 days      
Aggregate intrinsic value, Outstanding, beginning of period (in dollars)     $ 54  
Aggregate intrinsic value, Exercised (in dollars) $ 42      
Aggregate intrinsic value, Outstanding, end of period (in dollars) 626     $ 54
Aggregate intrinsic value, Options, Exercisable $ 480