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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 119 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Schedule of Marketable Securities [Line Items]            
Write down of marketable securities $ 0 $ 0 $ 0 $ 0 $ 158 $ 1,007
Securities (Assets) [Member]
            
Schedule of Marketable Securities [Line Items]            
Cost 860   860   811 860
Unrealized gain (loss) (51)   (51)   175 (51)
Fair value 809   809   986 809
Black Isle Resources [Member]
            
Schedule of Marketable Securities [Line Items]            
Cost 36   36   36 36
Unrealized gain (loss) (16)   (16)   0 (16)
Fair value 20   20   36 20
Sprott Resources Corp. [Member]
            
Schedule of Marketable Securities [Line Items]            
Cost 139   139   139 139
Unrealized gain (loss) 76   76   75 76
Fair value 215   215   214 215
Canadian Phoenix [Member]
            
Schedule of Marketable Securities [Line Items]            
Cost 81   81   81 81
Unrealized gain (loss) 11   11   14 11
Fair value 92   92   95 92
Other [Member]
            
Schedule of Marketable Securities [Line Items]            
Cost 604   604   555 604
Unrealized gain (loss) (122)   (122)   86 (122)
Fair value $ 482   $ 482   $ 641 $ 482