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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 129 Months Ended
Dec. 31, 2011
Sep. 30, 2012
Schedule of Marketable Securities [Line Items]    
Cost $ 811 $ 848
Unrealized gain (loss) 175 19
Fair value 986 867
Write down of marketable securities 158 1,007
Sprott Resources Corp. [Member]
    
Schedule of Marketable Securities [Line Items]    
Cost 139 139
Unrealized gain (loss) 75 79
Fair value 214 218
Silver Predator [Member]
    
Schedule of Marketable Securities [Line Items]    
Cost 87 87
Unrealized gain (loss) 55 23
Fair value 142 110
Canadian Phoenix [Member]
    
Schedule of Marketable Securities [Line Items]    
Cost 99 99
Unrealized gain (loss) (4) (1)
Fair value 95 98
Other [Member]
    
Schedule of Marketable Securities [Line Items]    
Cost 486 523
Unrealized gain (loss) 49 (82)
Fair value $ 535 $ 441