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Common Shares, Summary Of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capital Stock [Abstract]        
Number of options, beginning of period (in shares) 1,544,500 2,257,500 2,257,500  
Granted, Number of options (in shares) 0 50,000 0  
Number of options, Exercised (in shares)   (65,500)    
Number of options, Expired (in shares) (400,000) (697,500)    
Number of options, end of period (in shares) 1,144,500 1,544,500 2,257,500 2,257,500
Number of options, Exercisable (in shares) 898,250      
Weighted average exercise price per option, beginning of period (in dollars per share) $ 1.05 $ 1.60 $ 1.60  
Weighted average exercise price per option, Granted (in dollars per share)   1.11    
Weighted average exercise price per option, Exercised (in dollars per share)   0.39    
Weighted average exercise price per option, Expired (in dollars per share) 2.87 2.91    
Weighted average exercise price per option, end of period (in dollars per share) 0.42 $ 1.05 $ 1.60 $ 1.60
Weighted average exercise price, Exercisable (in dollars per share) $ 0.43      
Weighted average remaining contractual term, Outstanding 1 year 1 month 24 days 1 year 9 months 15 days 2 years 7 days 3 years 7 days
Weighted average remaining contractual term, Exercisable 1 year 2 months 9 days      
Aggregate intrinsic value, Outstanding, beginning of period (in dollars) $ 626      
Aggregate intrinsic value, Exercised (in dollars)   $ 42    
Aggregate intrinsic value, Outstanding, end of period (in dollars) 346 $ 626    
Aggregate intrinsic value, Options, Exercisable $ 262