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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Schedule of Marketable Securities [Line Items]      
Write down of marketable securities $ 39 $ 158 $ 959
Sprott Resources Corp. [Member]
      
Schedule of Marketable Securities [Line Items]      
Cost 18 139 18
Unrealized gain (loss) 2 75 2
Fair value 20 214 20
Silver Predator [Member]
      
Schedule of Marketable Securities [Line Items]      
Cost 60 87 60
Unrealized gain (loss)   55  
Fair value 60 142 60
Canadian Phoenix [Member]
      
Schedule of Marketable Securities [Line Items]      
Cost 99 99 99
Unrealized gain (loss) 26 (4) 26
Fair value 125 95 125
Other [Member]
      
Schedule of Marketable Securities [Line Items]      
Cost 447 486 447
Unrealized gain (loss) (26) 49 (26)
Fair value $ 421 $ 535 $ 421