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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 138 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2012
Current Marketable Equity Securities [Member]
Jun. 30, 2013
Current Marketable Equity Securities [Member]
Schedule of Marketable Securities [Line Items]          
Cost $ 602 $ 602 $ 624 $ 624 $ 602
Unrealized gain (loss) (363) (363) 2 2 (363)
Fair value 239 239 626 626 239
Write down of marketable securities   959   39  
Dividend Income Paid in Shares $ 109